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smangus
09-08-2019, 16:30
Hi Folks

Ok well I sorted the DCB1 (note to self make some summary notes on the thread :doh:) and now it's time to start on the Bigbottle MC phono stage that Oliver has invented with the assistance of Alan:). I have had the pcb for a while and been collecting parts for the past few months so am at the stage where I can start the build , hence the new thread to document the trials and tribulations of this numpty project :D. It is the 1st iteration of the board so MC only, not the more recent mm/mc one.

I've been thinking about this for a while and really wanted to expose the valves, however the board heatsink and other component sizes make this a bit difficult. Thinking on it I though I'd make a sub frame so that I can suspend the valve holders above the PCB, linking them by wire soldered onto the valve holder and then soldered onto the corresponding place on the pcb below. This can then sit just below the case and hopefully allow me to expose the valves for all to see and admire :stalks:

So I bought some 2 mill aluminium plate and did some drilling today to see if this make sense or not :mental: and made the subframe, the pics should give you an idea of what I mean. :)

smangus
09-08-2019, 16:31
Plate marked out.


https://uploads.tapatalk-cdn.com/20190809/a4b5f074470eefac29430a88a607fb37.jpg

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smangus
09-08-2019, 16:32
Introducing - Drill bit of the week!:D


https://uploads.tapatalk-cdn.com/20190809/6865893848f6dc5b10db95adda155779.jpg

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smangus
09-08-2019, 16:33
Holes done , mostly!


https://uploads.tapatalk-cdn.com/20190809/1c85bfb4c683db07b31040c67fcb6c6c.jpg

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smangus
09-08-2019, 16:35
Ok so this is what i mean by a suspended sub frame. Glad to have aligned the holes correctly and the valve holders fit just right above the corresponding place on the pcb. Just need to stuff the board now and then get the right height standoffs! :)




https://uploads.tapatalk-cdn.com/20190809/ce110df3075d6ab169e4868c5c7d6ca3.jpghttps://uploads.tapatalk-cdn.com/20190809/60732755d68c66881557ae439bd8ddef.jpghttps://uploads.tapatalk-cdn.com/20190809/b44fb683a14d3048fabbcd079501026c.jpg

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Bigman80
09-08-2019, 17:12
I love the inventiveness but you could've turned the board upside down and wired the valve bases?

smangus
09-08-2019, 17:14
I love the inventiveness but you could've turned the board upside down and wired the valve bases?

Ah yeah , now you mention it . Spoilsport!:lol:

Bigman80
09-08-2019, 17:15
Ah yeah , now you mention it . Spoilsport![emoji38]Haha, sorry!

smangus
09-08-2019, 17:15
Although I'm thinking of/investigating using some damping/isolation of the valve base so that would allow me to use that rather than straight to the board.

Bigman80
09-08-2019, 18:48
Although I'm thinking of/investigating using some damping/isolation of the valve base so that would allow me to use that rather than straight to the board.Ah, cool. Whatever works Andy [emoji4]

smangus
10-08-2019, 14:14
passed the Bigman eyesight test!


https://uploads.tapatalk-cdn.com/20190810/03fcac79253a7af24141a7fdd6e4eb53.jpg

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Bigman80
10-08-2019, 14:52
passed the Bigman eyesight test!


https://uploads.tapatalk-cdn.com/20190810/03fcac79253a7af24141a7fdd6e4eb53.jpg

Sent from my SM-G950F using TapatalkWell done Andy,

Always put the resistors in first then the Fets. If you get any static without resistors in place it'll blow the fet, potentially.

Don't want to have to do that twice!

smangus
10-08-2019, 15:11
no I have spares but v fiddly! lol.

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Bigman80
10-08-2019, 15:21
no I have spares but v fiddly! lol.

Sent from my SM-G950F using TapatalkThat's the hardest part done though.

smangus
10-08-2019, 15:37
well have to stop for a while now as my soldering iron just blew! A massive spark and crack! Bummer. have to get a new one. You can see the black mark in the join where it went. An Antex one too so not cheap . Meh [emoji2959]

https://uploads.tapatalk-cdn.com/20190810/e978459100201448268974daf64a3e27.jpg

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smangus
10-08-2019, 15:47
looked inside and loks like a split cap!https://uploads.tapatalk-cdn.com/20190810/13898f856c02f832c5ab85e8cf46a861.jpg

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Bigman80
10-08-2019, 20:24
looked inside and loks like a split cap!https://uploads.tapatalk-cdn.com/20190810/13898f856c02f832c5ab85e8cf46a861.jpg

Sent from my SM-G950F using TapatalkOh wow. Glad you weren't hurt!

smangus
10-08-2019, 20:30
Oh wow. Glad you weren't hurt!Thanks, I'm fine just pissed off! have ordered another , different make so will have to wait until that arrives.

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Bigman80
11-08-2019, 08:04
Thanks, I'm fine just pissed off! have ordered another , different make so will have to wait until that arrives.

Sent from my SM-G950F using TapatalkI've had my cheap Chinese one for 2 years and it's been utterly reliable. Can't grumble for £15 TBH.

smangus
11-08-2019, 20:27
A sound investment then! Gonna send it to Antex , prob out of guarantee but they should know how it failed and the component in case of others. Got a 50 note solder station coming. :) good reviews on the net etc.

Bigman80
11-08-2019, 20:37
A sound investment then! Gonna send it to Antex , prob out of guarantee but they should know how it failed and the component in case of others. Got a 50 note solder station coming. :) good reviews on the net etc.Good stuff!

smangus
12-08-2019, 19:03
New solder box thingy[emoji846]https://uploads.tapatalk-cdn.com/20190812/6f80152615ef01ed6441e4db4dd92f4b.jpg

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smangus
12-08-2019, 19:05
Resistors are futile![emoji41]https://uploads.tapatalk-cdn.com/20190812/0354237f6259b43098fe37cdf060778c.jpghttps://uploads.tapatalk-cdn.com/20190812/964df3862dead2dfa9237d1d5d2a7bc9.jpghttps://uploads.tapatalk-cdn.com/20190812/ebaf8954a2ca6a353158a716117971b6.jpg

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smangus
12-08-2019, 19:09
double post

STD305M
12-08-2019, 19:19
Hi Andy
Looking good mate:wave:

Steve

Bigman80
12-08-2019, 19:37
New solder box thingy[emoji846]https://uploads.tapatalk-cdn.com/20190812/6f80152615ef01ed6441e4db4dd92f4b.jpg

Sent from my SM-G950F using TapatalkOooohh, tasty!

smangus
12-08-2019, 19:48
Hi Andy
Looking good mate:wave:

SteveCheers mate , hope you are well.

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smangus
12-08-2019, 19:50
Oooohh, tasty!still getting used to it but seems to work well so far. 10 spare tips with it all different shapes.

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Bigman80
12-08-2019, 20:25
still getting used to it but seems to work well so far. 10 spare tips with it all different shapes.

Sent from my SM-G950F using TapatalkLooks good. The resistors never stood a chance lol

smangus
12-08-2019, 20:26
Looks good. The resistors never stood a chance lol[emoji41][emoji23]

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smangus
14-08-2019, 17:50
Bit more done today [emoji846]https://uploads.tapatalk-cdn.com/20190814/821906b753cf9890d7bce972a2781662.jpghttps://uploads.tapatalk-cdn.com/20190814/68240633da9127ffb2cb752701c1ef2f.jpghttps://uploads.tapatalk-cdn.com/20190814/9aacbfffa9ece97748d02ce7a315427a.jpghttps://uploads.tapatalk-cdn.com/20190814/417fb26bcc9d92ad4e8d186697419772.jpg

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Bigman80
14-08-2019, 17:55
Bit more done today [emoji846]https://uploads.tapatalk-cdn.com/20190814/821906b753cf9890d7bce972a2781662.jpghttps://uploads.tapatalk-cdn.com/20190814/68240633da9127ffb2cb752701c1ef2f.jpghttps://uploads.tapatalk-cdn.com/20190814/9aacbfffa9ece97748d02ce7a315427a.jpghttps://uploads.tapatalk-cdn.com/20190814/417fb26bcc9d92ad4e8d186697419772.jpg

Sent from my SM-G950F using TapatalkTidy tidy

Awesome stuff.

smangus
14-08-2019, 18:21
Tidy tidy

Awesome stuff.


Thanks.:) Discovered the joys of using a lead bender this time round , makes life a lot easier! :lol:

Bigman80
14-08-2019, 18:41
Thanks.:) Discovered the joys of using a lead bender this time round , makes life a lot easier! [emoji38]Hahaha, yes, they are a delight aren't they

smangus
19-08-2019, 17:00
Doing some layout planning. Wanted to use Mundorf caps after the difference they made in my DCB1. So bought some and found they are too large to put in the board, gonna have to use some flying leads. More numpty goings on lol [emoji1787]


https://uploads.tapatalk-cdn.com/20190819/772ce0b5576d25ae5c690a933101d894.jpghttps://uploads.tapatalk-cdn.com/20190819/e812d6ec2662ec25c767d8b82f82a3a7.jpg

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Bigman80
19-08-2019, 17:06
Oh no!

Can't get them with the right lead spacing?

Send them back and use some Nichicon ones.

smangus
19-08-2019, 17:24
Its ok I should have checked, want to use them as they were a noticable difference when swapped with Nichicons. Have ordered some brackets to fit now anyhow, just another learning point, no compromise!

If it goes tits up I can always blame the boards designer [emoji12] lol

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Bigman80
19-08-2019, 18:03
Its ok I should have checked, want to use them as they were a noticable difference when swapped with Nichicons. Have ordered some brackets to fit now anyhow, just another learning point, no compromise!

If it goes tits up I can always blame the boards designer [emoji12] lol

Sent from my SM-G950F using TapatalkHa, I like your style Andy.

Yes, by all accounts blame the board designer, it wasn't me lol

smangus
19-08-2019, 18:07
Yes, by all accounts blame the board designer, it wasn't me lol

:D

smangus
21-08-2019, 10:54
Got the dc blocker board, started to look a bit crowded so need a slightly wider case I think[emoji846] Another 5 cm should do it I reckon. https://uploads.tapatalk-cdn.com/20190821/b71e39182dca196949468969ca04eea9.jpghttps://uploads.tapatalk-cdn.com/20190821/89ac427a3b7f895f706550cb0c1128be.jpg

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Bigman80
21-08-2019, 12:50
That's a shame. Is that with the same case as I used for mine?

smangus
21-08-2019, 13:04
That's a shame. Is that with the same case as I used for mine?Hi no, decided I want something woody, bit like my head [emoji12]. Used yours to get initial sizing, I have some spare birch ply so will use that for top and sides . Need to order a pre-cut aluminium base and back plate for it though. [emoji41]

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Bigman80
21-08-2019, 13:32
Hi no, decided I want something woody, bit like my head [emoji12]. Used yours to get initial sizing, I have some spare birch ply so will use that for top and sides . Need to order a pre-cut aluminium base and back plate for it though. [emoji41]

Sent from my SM-G950F using TapatalkOh, DIY case too. Good grief, I've created a monster lol

brian2957
21-08-2019, 14:43
Thanks.:) Discovered the joys of using a lead bender this time round , makes life a lot easier! :lol:

I just found myself asking why you would need a plumber's tool to build an amp :D

That looks like a neat little tool :)

Bigman80
21-08-2019, 15:11
I just found myself asking why you would need a plumber's tool to build an amp :D

That looks like a neat little tool :)Work fantastic mate.

smangus
21-08-2019, 15:45
Got this it's really neat!


https://www.ebay.co.uk/itm/Sunhayato-RB-5-Lead-Bender-Resistor-RB5/263615475697?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

smangus
21-08-2019, 15:48
Oh, DIY case too. Good grief, I've created a monster lol

He he , 100% numptyness this time round :mad: !

Bigman80
21-08-2019, 16:28
He he , 100% numptyness this time round :mad: !Haha, I am sure you'll be fine.

Cycleallday
21-08-2019, 19:30
Hi no, decided I want something woody, bit like my head [emoji12]. Used yours to get initial sizing, I have some spare birch ply so will use that for top and sides . Need to order a pre-cut aluminium base and back plate for it though. [emoji41]

Sent from my SM-G950F using Tapatalk

Andy pm me with details of the base and back and I’ll see if I can help out (no cost). Need to know size of base and back, thickness of alloy and would you prefer 2 pieces or a single unit with back bent up from base ?

ASAP if you would like me to help as I am a bit poorly and due to go in hospital after which I will be unable to get to the workshop for 3 months or so.

Mel

smangus
21-08-2019, 19:39
Andy pm me with details of the base and back and Iíll see if I can help out (no cost). Need to know size of base and back, thickness of alloy and would you prefer 2 pieces or a single unit with back bent up from base ?

ASAP if you would like me to help as I am a bit poorly and due to go in hospital after which I will be unable to get to the workshop for 3 months or so.

Mel

Hi Mel

Wow,:eek: thanks very much for the offer of help that's really generous of you. I'll pm you some dims in a minute. I hope that all goes well with the Hospital visit.

Cheers v much :cool: :)

Andy

Cycleallday
21-08-2019, 20:14
Not that much rush!

Consider what you really want and how it will fit into the timber surround before responding and we will agree what I can do and if it meets your needs.

Mel

smangus
21-08-2019, 20:31
You did say ASAP!:D

Ok will have another think and let you know in a couple of days :)

smangus
28-08-2019, 15:32
Many thanks to Mel who sent through the Aluminium plate with a couple of spare backs in case of numpty drilliing mishaps!

Cheers Mel !

This gives an out line of the layout including DC blocker. I'm just waiting for some silicon dampers and then I can measure up the wood.

The other pic show the leads from the valve socket which I have started to attach. https://uploads.tapatalk-cdn.com/20190828/4498b2b97b7feba73047eb04a34b568b.jpghttps://uploads.tapatalk-cdn.com/20190828/2345b24c524706b8273889274b3e81ca.jpg

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Bigman80
28-08-2019, 16:03
Not far off from completion matey.

Excellent!

smangus
28-08-2019, 16:13
Not far off from completion matey.

Excellent!

Trust me, there's a long way to go yet! lol

Bigman80
28-08-2019, 16:26
Trust me, there's a long way to go yet! lolHahaha, nah, it's just linking the bits together now and boxing it up. Hours work! [emoji38]

smangus
28-08-2019, 18:07
Hahaha, nah, it's just linking the bits together now and boxing it up. Hours work! [emoji38]

Gotta love an optimist!

Bigman80
28-08-2019, 18:28
Gotta love an optimist!Ha

smangus
31-08-2019, 14:21
Got the silicon dampers in the post today so finished the valve holder base which fits nicely. Quite surprised that my measurements all worked out lol.

Nice solid base of 4mm aluminium thanks to Mel [emoji106] , the revised sizing will give me lots of space in the box too. [emoji41]https://uploads.tapatalk-cdn.com/20190831/3ae92c5f11b81dc0f61c9fc34cac85da.jpghttps://uploads.tapatalk-cdn.com/20190831/c68cb98ccd0e5b2f51e1a1f35789b122.jpg

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smangus
06-09-2019, 17:49
Marking out back plate holes n stuff. https://uploads.tapatalk-cdn.com/20190906/1a08c359cd42c099d6b39d0fa80a1c75.jpg

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Bigman80
06-09-2019, 17:50
Looking good Andy,

This will be a good looking unit, I can feel it!

smangus
06-09-2019, 18:03
Thanks Oliver , it's taking a bit of working out but that's part of the fun! I have some spare birch ply and maple veneer so with Mel's very kind help the case won't have cost me anything when finished!

Also hopefully the maple will look nice when oiled/varnished with the valves exposed, that's my final intention anyway with a bit of luck. [emoji41]

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Bigman80
06-09-2019, 18:25
Thanks Oliver , it's taking a bit of working out but that's part of the fun! I have some spare birch ply and maple veneer so with Mel's very kind help the case won't have cost me anything when finished!

Also hopefully the maple will look nice when oiled/varnished with the valves exposed, that's my final intention anyway with a bit of luck. [emoji41]

Sent from my SM-G950F using Tapatalk

SOunds grand matey.

I'm looking forward to seeing it!

smangus
06-09-2019, 18:31
Yeah but 1 slip of the router....[emoji33] lol

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Bigman80
06-09-2019, 18:33
Yeah but 1 slip of the router....[emoji33] lol

Sent from my SM-G950F using TapatalkJust take your time!

Don't rush.

smangus
06-09-2019, 19:42
Never rush [emoji6]

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smangus
08-09-2019, 18:40
Had a play with the drill today and starting to see the layout come together [emoji846]the 2 large holea a tge back are for the socket and switch.

Hack saw blade broke halfway through tidying up yhe hole so had ti stop but it gives an idea.

quit please dwith how it's coming along now [emoji41]https://uploads.tapatalk-cdn.com/20190908/25f8fc8dff204ceed546675568ed5e0e.jpghttps://uploads.tapatalk-cdn.com/20190908/c921b1e249e851f80cc04c8e154f300f.jpghttps://uploads.tapatalk-cdn.com/20190908/2bf8c337f5de2be2657e857cd466e99b.jpghttps://uploads.tapatalk-cdn.com/20190908/161bd12fa53474ea052b88dafb4ba6f7.jpghttps://uploads.tapatalk-cdn.com/20190908/99aaf6af5479d73cfed06e461fba1211.jpg

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Bigman80
08-09-2019, 19:11
Looking good!!

Coming along nicely

smangus
16-09-2019, 16:13
Valve Flying lead dry run. bit fiddly but gives an idea of what I'm trying to achieve [emoji846]https://uploads.tapatalk-cdn.com/20190916/c3011657f78058e36e73df21b62c0995.jpghttps://uploads.tapatalk-cdn.com/20190916/5020160e561d3a79a2a1e1ac3440056f.jpghttps://uploads.tapatalk-cdn.com/20190916/eb0e74d4a5e43d99d2be52ae14671d17.jpg

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smangus
16-09-2019, 16:15
Imagine 3 valves lol https://uploads.tapatalk-cdn.com/20190916/1f005a680e4b6a819844e5d4632a3dbd.jpg

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Bigman80
16-09-2019, 16:39
Looking good!

smangus
07-10-2019, 13:59
Finally finished the board [emoji12]! Will attach the rest of the power caps once I have finalised the case. Need to concentrate on that now lol! https://uploads.tapatalk-cdn.com/20191007/3c085ce09e282120935f791b0c4f276e.jpghttps://uploads.tapatalk-cdn.com/20191007/0d322473a1a63fe095a51da1e07454e1.jpghttps://uploads.tapatalk-cdn.com/20191007/c7007b89225c42ddc074b3e3c4a076ca.jpghttps://uploads.tapatalk-cdn.com/20191007/520635c365bf85b006ed88770814ca93.jpghttps://uploads.tapatalk-cdn.com/20191007/271eecd24e0c5d4318a57dbf64dbe082.jpghttps://uploads.tapatalk-cdn.com/20191007/7da24e91609cf1a060762de90ada9c5d.jpg

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Bigman80
07-10-2019, 14:04
Haha,

I love it.

Getting close now

smangus
07-10-2019, 14:14
Getting close now

Whoa ! Steady there....lol:eek::D

Will have to pick your brains re wiring later some time.

Bigman80
07-10-2019, 14:18
Whoa ! Steady there....lol:eek::D

Will have to pick your brains re wiring later some time.No worries.

smangus
08-10-2019, 16:28
I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his :lol:) or some such coming through instead of clean vinyl style tunez :scratch:

To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm :scratch:

In the mean time any thoughts/advice most welcome!

If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

Cheers Electronumpty! :)

Bigman80
08-10-2019, 16:36
I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his :lol:) or some such coming through instead of clean vinyl style tunez :scratch:

To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm :scratch:

In the mean time any thoughts/advice most welcome!

If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

Cheers Electronumpty! :)

hmmm, I didnt think of that, not that i would have lol

smangus
08-10-2019, 17:40
All part of learning lol. There's me being a smart arse ! [emoji1787]

Bloody valve nonsense[emoji16]

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Bigman80
08-10-2019, 18:55
All part of learning lol. There's me being a smart arse ! [emoji1787]

Bloody valve nonsense[emoji16]

Sent from my SM-G950F using TapatalkLol, it may be fine. There's no guarantee of interference. Especially once it's all cased up. Just something that could happen.

Barry
09-10-2019, 19:05
Finally finished the board [emoji12]! Will attach the rest of the power caps once I have finalised the case. Need to concentrate on that now lol! https://uploads.tapatalk-cdn.com/20191007/3c085ce09e282120935f791b0c4f276e.jpghttps://uploads.tapatalk-cdn.com/20191007/0d322473a1a63fe095a51da1e07454e1.jpghttps://uploads.tapatalk-cdn.com/20191007/c7007b89225c42ddc074b3e3c4a076ca.jpghttps://uploads.tapatalk-cdn.com/20191007/520635c365bf85b006ed88770814ca93.jpghttps://uploads.tapatalk-cdn.com/20191007/271eecd24e0c5d4318a57dbf64dbe082.jpghttps://uploads.tapatalk-cdn.com/20191007/7da24e91609cf1a060762de90ada9c5d.jpg

Sent from my SM-G950F using Tapatalk

Why do you want to separate the valve bases from the PCB?


I have been very kindly and nicely advised by a a fellow AOSer that lifting the valve bases off the PCB using leads may lead to the risk of oscillation and unwanted RF pick up with the BBC world service (my words not his ) or some such coming through instead of clean vinyl style tunez

To prevent this I will need grid stopper resisters near the valve bases it seems and so I'll have to read around the subject as this is way too techy for me atm

In the mean time any thoughts/advice most welcome!

If it comes to it I can always move the valve bases back to the PCB, which would be a shame but not a disaster!

Cheers Electronumpty!

It's called the Miller effect: http://www.valvewizard.co.uk/gridstopper.html

However if you do add grid stoppers, you will be changing Alan's design and perhaps the overall sound. I would suggest you seek Alan's advice.

Bigman80
09-10-2019, 20:40
Why do you want to separate the valve bases from the PCB?



It's called the Miller effect: http://www.valvewizard.co.uk/gridstopper.html

However if you do add grid stoppers, you will be changing Alan's design and perhaps the overall sound. I would suggest you seek Alan's advice.He wants the valves outside the chassis.

I did say he could've mounted the pcb upside down and made those connections very small lol.

Too late now.

smangus
09-10-2019, 21:59
Well that was the plan, [emoji848] so will have to rethink it. Its not a disaster as I can remount them on the pcb without to much hassle.

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smangus
09-10-2019, 22:03
Think I might hook up as is to see what it sounds like and test the board etc. then remount the sockets and finish the case off . Nothing lost there as I haven't cut the ply yet. Just need to add some ventilation into it.

All part of learning anyway so it's fine by me.

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Firebottle
10-10-2019, 07:38
Andy I would say try it first, there are some grid stoppers on the pcb.

You may get some instability with squeaks and noises. I think it would be OK to fit additional small value grid stoppers in the grid wires, I can advise as necessary.

smangus
10-10-2019, 10:05
Andy I would say try it first, there are some grid stoppers on the pcb.

You may get some instability with squeaks and noises. I think it would be OK to fit additional small value grid stoppers in the grid wires, I can advise as necessary.Thanks Alan thats very helpful, I'll give it a shot . Cheers

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smangus
17-10-2019, 16:08
Drilled and filed the back plate for the fittings. Will polish it up a bit some time [emoji846]https://uploads.tapatalk-cdn.com/20191017/f65fb73fe8b6dda0a5db539b87b512d9.jpghttps://uploads.tapatalk-cdn.com/20191017/bacd15f4cf3bfee7d2bac7d6bec90954.jpghttps://uploads.tapatalk-cdn.com/20191017/edfca7da71b1a806eaaac75b2c810c71.jpghttps://uploads.tapatalk-cdn.com/20191017/6bb95bb063aad5e737b3ed3cbf38b50d.jpghttps://uploads.tapatalk-cdn.com/20191017/5ceb1b9476950ba3bb0ca8087a57b34f.jpg

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Bigman80
17-10-2019, 17:19
Drilled and filed the back plate for the fittings. Will polish it up a bit some time [emoji846]https://uploads.tapatalk-cdn.com/20191017/f65fb73fe8b6dda0a5db539b87b512d9.jpghttps://uploads.tapatalk-cdn.com/20191017/bacd15f4cf3bfee7d2bac7d6bec90954.jpghttps://uploads.tapatalk-cdn.com/20191017/edfca7da71b1a806eaaac75b2c810c71.jpghttps://uploads.tapatalk-cdn.com/20191017/6bb95bb063aad5e737b3ed3cbf38b50d.jpghttps://uploads.tapatalk-cdn.com/20191017/5ceb1b9476950ba3bb0ca8087a57b34f.jpg

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Getting the the squeaky bum moment!!!!

smangus
17-10-2019, 18:15
Getting the the squeaky bum moment!!!![emoji22][emoji1787]

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smangus
19-10-2019, 18:34
Had a bash at polishing , pleased with the results [emoji846] Couple of deeper nicks still show slightly so may go back iver them some time.

Shiny shine! https://uploads.tapatalk-cdn.com/20191019/cca6153d27384bc67139430f1bd162ce.jpghttps://uploads.tapatalk-cdn.com/20191019/f2158841369af0b0ac68360fadc8d079.jpg

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Bigman80
19-10-2019, 18:59
Had a bash at polishing , pleased with the results [emoji846] Couple of deeper nicks still show slightly so may go back iver them some time.

Shiny shine! https://uploads.tapatalk-cdn.com/20191019/cca6153d27384bc67139430f1bd162ce.jpghttps://uploads.tapatalk-cdn.com/20191019/f2158841369af0b0ac68360fadc8d079.jpg

Sent from my SM-G950F using TapatalkOooh, looks posh!

smangus
19-10-2019, 19:32
Oooh, looks posh!

:) not me though, lol

smangus
09-11-2019, 18:09
Been busy latly so not much time but have done a bit today . sizeing up the leads for the caps hope to test the board tonight or tomorrow [emoji41]https://uploads.tapatalk-cdn.com/20191109/6687909472978c46712447a8ca262ef9.jpghttps://uploads.tapatalk-cdn.com/20191109/1fa6f80113637aebcaade68558644877.jpg

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Bigman80
09-11-2019, 19:24
Looking good mate.

smangus
09-11-2019, 20:35
Just ready for a test to see if the valves light up. Got to find them 1st lol. If I don't post again and you read a story of a major conflagration in SE London tomorrow you'll know whtas happened lol. [emoji23][emoji23] https://uploads.tapatalk-cdn.com/20191109/84173130227a766210f34529c31c9f24.jpghttps://uploads.tapatalk-cdn.com/20191109/d7c68e7633a0a6da7298cd595a396be0.jpg

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Bigman80
09-11-2019, 20:54
[emoji1787][emoji1787][emoji1787]

I hope it works!!!

smangus
09-11-2019, 21:01
Ok so this strange , no glow , measured voltage into and out of the dc blocker into the tx 243v or so ,ok. measured voltage going into the board on the 9v its 7.3 or something and on the 165 v its about 17v


Turned it off and double checked the wiring to the board from the tx and its fine . Tx is really hot now can't touch it.

Faulty tx?

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smangus
09-11-2019, 21:02
Oh there is no smoke either luckily [emoji2957]

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Bigman80
09-11-2019, 21:06
Oh there is no smoke either luckily [emoji2957]

Sent from my SM-G975F using TapatalkYou've got the wires on the traffo wrong I'd bet.

I did that once. Traffo made crackling noises as it got hot and I turned it off quickly.

You may not have the 9-0-9 right.

Or possibly the 165v.

Put a pic up of how it's wired.

smangus
09-11-2019, 21:08
here you go !https://uploads.tapatalk-cdn.com/20191109/3a10495a0f8a520951a5ac59b9609cf0.jpghttps://uploads.tapatalk-cdn.com/20191109/27feeffb759163ae6418740331c363a6.jpghttps://uploads.tapatalk-cdn.com/20191109/b475259b320cc586b16587e8e306495b.jpg

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Bigman80
09-11-2019, 21:11
OK, have you got connector blocks?

If so, disconnect the pcb and put the wires as you have them now.

Switch it on and measure what's coming to the connector blocks. If it's right there, you have an issue elsewhere.

Bigman80
09-11-2019, 21:12
Oh, be quick too as if you have the traffo wired wrong, you could burn it out very easily and that's not a cheap fix, as you know

smangus
09-11-2019, 21:12
ok thanks , will do tomorrow now cheers mate

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Bigman80
09-11-2019, 21:13
Also, do one winging at a time.

If you have the 909 wired right, it should read 9v on either side of the 0 and 18v if you measure the two outers.

Don't have the 165v wired up at all. Just separate the wires and secure them in connector blocks. Does that make sense.

If the 909 is right, you can then measure the 165v

smangus
09-11-2019, 21:29
Yes that make sense cheers

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Firebottle
10-11-2019, 08:25
Sounds like you have some sort of short on the 165V winding. Check you have the rectifier diodes the correct way round and also check for shorts with the soldered joints to the ground plane.

smangus
10-11-2019, 11:00
Thanks Alan will do , you mean these 4? https://uploads.tapatalk-cdn.com/20191110/4779387984841bdd0b884ab608876344.jpg

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Bigman80
10-11-2019, 12:18
Thanks Alan will do , you mean these 4? https://uploads.tapatalk-cdn.com/20191110/4779387984841bdd0b884ab608876344.jpg

Sent from my SM-G975F using TapatalkThose look right

Firebottle
10-11-2019, 12:28
Yes Andy. With the 165 voltage being pulled down so much there must be a fault in that area.

smangus
10-11-2019, 13:32
Ok will check the tranny and then the soldering underneath for potential shorts. Thanks for the help [emoji846]

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smangus
10-11-2019, 15:38
Got distrated and doing some case work. But once the switch etc is fitted it will make it easier to test so no loss there . lol https://uploads.tapatalk-cdn.com/20191110/0955ce665effde039a746991cba9fd89.jpghttps://uploads.tapatalk-cdn.com/20191110/81006f7595432720076ae7d4e90e2446.jpg

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smangus
10-11-2019, 17:06
so tested the tranny 9v windings read 9.6v and 19.23v across the 2

165v winding reads 176.4v - seems too high so is it borked? [emoji848]https://uploads.tapatalk-cdn.com/20191110/5a651a0049f1f56e98af2db744443d20.jpg

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Barry
10-11-2019, 18:17
Are those figures "off load"?

smangus
10-11-2019, 18:24
If you mean not connected to the PCB etc then yes.

Barry
10-11-2019, 20:07
They are about 7% higher when not drawing current, which is not unusual.

Bigman80
10-11-2019, 20:21
Yep, looks like you have a short, as Alan said.

That could be a right pain to find [emoji53]

smangus
10-11-2019, 21:02
They are about 7% higher when not drawing current, which is not unusual.

Ah ok thanks for that, so for 165v that puts it at 176.56v which is almost dead on , that's a relief as when it heated up so much I was worried I'd blown it . :eek:

smangus
10-11-2019, 21:05
Yep, looks like you have a short, as Alan said.

That could be a right pain to find [emoji53]

No doubt, me and my bright ideas! lol . Had a good look at the bottom of the board and nothing stood out to my eyes under a magnifier. will check again but hard to know where to start. At least it soundslike I don't need a new traffo so every cloud etc. :D

Bigman80
10-11-2019, 21:15
No doubt, me and my bright ideas! lol . Had a good look at the bottom of the board and nothing stood out to my eyes under a magnifier. will check again but hard to know where to start. At least it soundslike I don't need a new traffo so every cloud etc. :DIt will be something blatantly obvious when you find it.

smangus
10-11-2019, 21:18
It will be something blatantly obvious when you find it.I love the encouragement [emoji23][emoji23][emoji23][emoji23][emoji23]

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Bigman80
10-11-2019, 21:19
I love the encouragement [emoji23][emoji23][emoji23][emoji23][emoji23]

Sent from my SM-G975F using TapatalkHahaha, I've been there mate. A stray bit of solder just touching another and it send everything to shit.

Luckily, I got Alan on the doorstep.

smangus
10-11-2019, 21:22
Hahaha, I've been there mate. A stray bit of solder just touching another and it send everything to shit.

Luckily, I got Alan on the doorstep.note to self - "If you're going to keep on with this numpty stuff move up North" .....

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Bigman80
10-11-2019, 21:23
note to self - "If you're going to keep on with this numpty stuff move up North" .....

Sent from my SM-G975F using TapatalkLmao, there's got to be local genius in your area.

smangus
10-11-2019, 21:23
Lmao, there's got to be local genius in your area.Post office works......



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Bigman80
10-11-2019, 21:42
Post office works......



Sent from my SM-G975F using TapatalkHahaha, let him know there's Incoming lol

smangus
10-11-2019, 21:52
Yeah ill give i another look 1st. lol

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smangus
10-11-2019, 21:53
The advantage is he knows the circuit too, rather than get somebody new to it.

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Bigman80
10-11-2019, 22:09
The advantage is he knows the circuit too, rather than get somebody new to it.

Sent from my SM-G975F using TapatalkHe should do shouldn't he lol. Hahaha!

smangus
12-11-2019, 14:25
Ok so I cleaned the bottom of the pcb with IPA and got some gunk off to see if that made a difference, tried it again but no joy

9v reads 7.4v and 165v reads 2.66v , now I'll check all components are in the right place, looks like the 165 is the issue.


The on button glows a nice shade of green mind, so quite pleased with that:D

Bigman80
12-11-2019, 14:39
Ok so I cleaned the bottom of the pcb with IPA and got some gunk off to see if that made a difference, tried it again but no joy

9v reads 7.4v and 165v reads 2.66v , now I'll check all components are in the right place, looks like the 165 is the issue.


The on button glows a nice shade of green mind, so quite pleased with that:DYou've defo got an issue on the 165 side, the 9 side looks fine with that voltage.

Bugger.

smangus
12-11-2019, 14:46
You've defo got an issue on the 165 side, the 9 side looks fine with that voltage.

Bugger.

Well I guess 1 out of 2 is not bad, a 50% success rate lol:lol:

Bigman80
12-11-2019, 14:47
Well I guess 1 out of 2 is not bad, a 50% success rate lol[emoji38]It could just be something as simple as a resistor of the wrong value.

smangus
12-11-2019, 14:50
It could just be something as simple as a resistor of the wrong value.

Yeah going to check them all , could take a while.

smangus
12-11-2019, 15:36
ok so far 2 resistors look all over the place when measured - R143 and R141 the readings don't go to the proper value and constantly change on the MM. I can't see how they can have shorted from the soldering so maybe they just need replacing? Measured on the lead in by the body so shouldn't make a difference if they are in circuit no?

Firebottle
12-11-2019, 16:40
The readings are going to change due to capacitance in the circuit.

I can't remember if the heatsinks are earthed, have you isolated V145 (Fet) from its heatsink.
To try to isolate the short lift up one end of R151, 390 ohms and try again. If still shorted the problem is by the rectifiers and regulator Fet V145. If not the problem is further down the circuit.

smangus
12-11-2019, 17:03
The readings are going to change due to capacitance in the circuit.

I can't remember if the heatsinks are earthed, have you isolated V145 (Fet) from its heatsink.
To try to isolate the short lift up one end of R151, 390 ohms and try again. If still shorted the problem is by the rectifiers and regulator Fet V145. If not the problem is further down the circuit.

ok I'll give it a shot

Thanks for the suggestion, haven't isolated the heatsink but will do.

Cheers

smangus
12-11-2019, 17:06
When you say "try again" do mean add the power from the tranny or measure the Rs again?

struth
12-11-2019, 17:08
re measure

smangus
12-11-2019, 17:09
re measure

ta v much :)

Firebottle
12-11-2019, 17:14
No I meant apply power again.

struth
12-11-2019, 17:14
resistors rarely go short. can change value tho especially if a lot of current is passed through them from a short elsewhere.. bad soldering could also cause it. small components on a tight board and its easy to cause a short.

smangus
12-11-2019, 17:22
ok did that after isolating the FET from the heatsink and R151 - R143 and R141 measure ok now , have to go out now but thanks for the help.

Tune in next time for more adventures of Electronumpty….:D

Bigman80
12-11-2019, 17:51
Isolate everything on a heatsink. Top hats and pads.

Heatsinks are grounded

smangus
12-11-2019, 22:25
Isolate everything on a heatsink. Top hats and pads.

Heatsinks are grounded

Cool , any ideas what I should check next?

Bigman80
12-11-2019, 22:25
Cool , any ideas what I should check next?Nope lol, Alan's the man for that bit.

smangus
12-11-2019, 22:59
Nope lol, Alan's the man for that bit.

:doh:

Bigman80
12-11-2019, 23:48
:doh:Yep, sorry mate. I'm only the middle man.

smangus
13-11-2019, 07:52
No I kinda knew that , just forgot lol

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smangus
14-11-2019, 18:08
ok so cleaned my glasses [emoji41] and found this on the V103 , could be the culprit? Gonna tidy it up and find out. https://uploads.tapatalk-cdn.com/20191114/bd91be839ce53f55fd4fcdd64dd85c77.jpg

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Marra
14-11-2019, 18:22
Whoops. I hope that sorts it.

Firebottle
14-11-2019, 18:31
Could be Andy :thumbsup:

Bigman80
14-11-2019, 18:37
Fingers crossed

smangus
14-11-2019, 18:56
Ok so hooked up and no joy , measures the same no valve glow, bummer . I need to have a look at the top of the board maybe and see if it has the same short but will need dismantle some bits 1st so no time tonight. Never mind but it's 1 fault out the way;)

Tune in next time pop pickers for some more electrickery adventure... :D

smangus
16-11-2019, 21:18
Spent a couple of hours with the MM today found 3 shorts to sort out, a couple not very obvious at all. I dunno what numpty put this together but there's no quality control around these parts :D

Bigman80
16-11-2019, 21:27
Spent a couple of hours with the MM today found 3 shorts to sort out, a couple not very obvious at all. I dunno what numpty put this together but there's no quality control around these parts :D[emoji15]

Hopefully, it's that simple mate. Really hope you get it going.

smangus
16-11-2019, 21:35
Thanks , it does help when you find something though. Feels like you are making progress , however small it is[emoji846]

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smangus
05-01-2020, 12:08
So no I haven't given up on this , too busy at xmas to do anything with it bit a dry day yesterday and some time meant I could cut the side of the case. test dry clamp before gluing, 18 mil birch ply. [emoji41] seems to fit ok [emoji846]https://uploads.tapatalk-cdn.com/20200105/4c48a01b7289a3df890b857c76808f27.jpghttps://uploads.tapatalk-cdn.com/20200105/233e98ab12699b3069032b9e013a1b18.jpg

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smangus
05-01-2020, 13:15
with the lid on glue next.

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https://uploads.tapatalk-cdn.com/20200105/3dd63e7be371484b07b9c3a4907da72d.jpg
https://uploads.tapatalk-cdn.com/20200105/8312cad9656ccba4774643561da29596.jpg

smangus
05-01-2020, 16:55
Sides glued and trying for size , seems to fit so feeling pretty pleased. [emoji846]https://uploads.tapatalk-cdn.com/20200105/8b2a6f59c3cd94c8d1c740a830ed28fb.jpg

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struth
05-01-2020, 17:24
coming on :)

Made in 1968
05-01-2020, 17:26
Andy:
What make are those corner clamps?

smangus
05-01-2020, 17:41
Andy:
What make are those corner clamps?

hi Andre

They're cheap Chinese jobbies no brand. Do a search on ebay for corner clamps and you'll get a few options - 4 for less thank a tenner. Had em ages they are ok and do a job.

Made in 1968
05-01-2020, 17:43
Are they a true 90 Degrees? Ive got a couple of old Marples jobbies but they can get really expensive..

smangus
05-01-2020, 17:55
Are they a true 90 Degrees? Ive got a couple of old Marples jobbies but they can get really expensive..

Checked with a square and they seem ok, not the best finish but ok for what I need.

smangus
10-01-2020, 17:16
ok finished the side and front with some fillet to keep inplace. Ill drill them and use some s bolts for the fixing to the base and side. https://uploads.tapatalk-cdn.com/20200110/e71dfde84c22247bdc8016d8074d8299.jpghttps://uploads.tapatalk-cdn.com/20200110/826df8a4672cfb01ea644e0010048064.jpghttps://uploads.tapatalk-cdn.com/20200110/6beda2e6c5e77aa3dcb792e96534e850.jpg

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smangus
10-01-2020, 17:18
With the top fitted for size , still need to cut to size and drill valve and ventilation holes. then ill veener it and add some trim to the edges. Another new adventure! https://uploads.tapatalk-cdn.com/20200110/c761ee34269738e0844755ee2d44b666.jpghttps://uploads.tapatalk-cdn.com/20200110/675285c0e43b65f1921d8e908d984957.jpg

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smangus
21-02-2020, 17:45
Quck update , sorted the wiring after some fettling by th egood mr FB who added a couple of gridstoppers to one of the valve bases . https://uploads.tapatalk-cdn.com/20200221/1f7127faaf023c27ceae6a5459f29c41.jpg

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smangus
21-02-2020, 17:46
I drilled some hole in the base for ventilation, thye will sit under the pcb. https://uploads.tapatalk-cdn.com/20200221/fd62f63f8c8c9605310a3dcebf4c8e07.jpg

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smangus
21-02-2020, 18:00
After being reminded of what valves I should use [emoji16] There was glow stuff so I started on the socketshttps://uploads.tapatalk-cdn.com/20200221/df174d4fc345c49f76ec827cceeccbaa.jpghttps://uploads.tapatalk-cdn.com/20200221/61d6128dd60d164aa490ed6fe7a0ce58.jpghttps://uploads.tapatalk-cdn.com/20200221/9248cadd1686e7397dd2611aedb7117f.jpg

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smangus
21-02-2020, 18:03
Quick check for earthing etc and so now for a test out, All works! I need to tidy up the wirimg a bit but all sounds good . [emoji846]https://uploads.tapatalk-cdn.com/20200221/d43201dea5ec15e043a30c6b93182969.jpghttps://uploads.tapatalk-cdn.com/20200221/8f39c73ff065cf15d67673f0037f452a.jpghttps://uploads.tapatalk-cdn.com/20200221/7ce01e1dfb9b510589b3a8ff562f998c.jpg

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gninnam
21-02-2020, 19:14
Like it - good work :D

nuff
21-02-2020, 19:19
You’ve done a good job there Andy! it’s given me the boost I needed to get on with mine.
I tried doing my build slightly cheaper and ordered an R-core transformer from eBay. I couldn’t get the correct voltages from it neither could a friend who builds his own amps etc. It put a right damper on it for me and I gave up but He advised me to contact the seller and ask for a refund (I did) Now I have a refund I’ve just ordered a transformer from Toroidy.pl so I could do with getting on with the rest of it before it arrives.
Glad it's up and running mate. Enjoy!

smangus
21-02-2020, 19:44
Thanks , I'm feeling really chuffed about it and its sounding pretty good already so we'll see what its like burnt in. Tbh I did have a couple of ffs moments but it's worth the effort if you can get through it. If you really don't want to stress out buy a case , don't make one!:mental:

smangus
21-02-2020, 19:53
Oh yes I found Toroidy pretty efficient so you shouldn't have to wait long for the tx.

smangus
21-02-2020, 19:55
Like it - good work :D

Thanks! Need to sort the cover now.

nuff
21-02-2020, 20:18
Thanks , I'm feeling really chuffed about it and its sounding pretty good already so we'll see what its like burnt in. Tbh I did have a couple of ffs moments but it's worth the effort if you can get through it. If you really don't want to stress out buy a case , don't make one!:mental:

Cases are so expensive. The 1 I like is the same as what Oli used but itís £80 :eek: Iíll probably go for that 1 though. I havenít time to be making 1.

nuff
21-02-2020, 20:23
What cable are you using for the sockets? That was my next step. Cable AWG and make.

smangus
23-02-2020, 10:33
So some observations I made about the sound so far -

So some initial impressions of the BB . First caveat is that I cannot compare to any stages costing more than £200 as I have never heard any, second is that my reference is to a Firebottle OTP which I have had for a few years and enjoyed immensely during that time , cost about £220 if I recall correctly.

Also these comments are only after 5/6 hours listening so I imagine there is more to come , but I like listening to kit as it beds in and seeing the difference as the sound develops.

1st thing I noticed was the extension on cymbals, after the hit the decay wwas long and gradual, they really shimmered when listening the Bonzo on Zep 4.

Second immediate standout was the presence and immediacy of the sound , the closest I can describe is almost like a wall of sound. Now this is something that I quite like but took me by surprise. However as things progessed this wall gave way to much more defined detail but still had that immediacy and presence.

As it played the soundstage became deeper as tike went on, very 3D to me, almost made the OTP sound flat, 2D in comparison, it isnít, but thereís a very noticable difference in depth.

Next was the tone, I donít have much experience of valve kit but I imagine this is largely down to what ones are being used. Rich and crunchy guitars, natural vocals where you can hear the intake of breath and slight modulations in notes that werenít there beforehand. Another factor of detal developing.

Bass was slightly recessed at first and the lower registers not really hitting, but I have had this with Mundorf caps before in the DCB1 so wasnít worried, true to form by the 3rd album it was starting to come on stronger , still a bit to develop I think but its early days.

Playing some Elton John the piano sounds really natural and on tracks like Crocodile Rock the boogie factor really comes through which is great.

As an example of detail, on Zep 4 the more rocky tracks have a great and full guitar sound quite particular to that Zep album. Heard before the 2 channels L and R sound like 2 different guiters playing the same/similar riffs. Now they are, but what I can pick out now is that often they are both in different keys (not a musician but thats the impression I get) and also playing differnt licks and notes to add to the overall effect. Quite complex but not apparent to me so obviously before.

Finally when I say the music has more presence itís not bloated or forced in any way, it still sounds very natural.

More soon but very pleased so far , good job Oliver and Alan!






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smangus
23-02-2020, 10:39
What cable are you using for the sockets? That was my next step. Cable AWG and make.Hi pm sent with link , [emoji846]

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nuff
23-02-2020, 15:03
Hi pm sent with link , [emoji846]

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Thanks Andy!

smangus
29-02-2020, 14:44
Tisied up the wiring and added an earth to the top plate. Need a dry day to drill the valve holes for the cover but its all working now [emoji846]https://uploads.tapatalk-cdn.com/20200229/468d9a1539a678bbf9f7768e07a78f8a.jpg

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smangus
06-03-2020, 17:17
Managed to drill holes today when a gap in the cloud presented itself. 1 couple of mil out but not too bad ! https://uploads.tapatalk-cdn.com/20200306/da5bb8d7c1a719413c65ecddd51e49bc.jpghttps://uploads.tapatalk-cdn.com/20200306/af9a3ca54eaacc087e4bb1bb1fef20c5.jpg

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smangus
06-03-2020, 17:27
Had to have a test listen[emoji846]https://uploads.tapatalk-cdn.com/20200306/347a91f90dcf404ba5c98241dfc88dc5.jpg

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smangus
28-03-2020, 22:55
Checking veneer , Walnut and Maple, bottom shows comparison with bare wood after 3 coats of danish oil.

https://uploads.tapatalk-cdn.com/20200328/81d3e97cb1744ca77044975eac1047d0.jpg

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smangus
29-03-2020, 08:59
All done need to sand etc now. https://uploads.tapatalk-cdn.com/20200329/19faeaf0d4fb299f033f9c38c6717f0f.jpghttps://uploads.tapatalk-cdn.com/20200329/098d94e639e5d33526ae7da7ffad6908.jpg

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smangus
29-03-2020, 10:33
Front https://uploads.tapatalk-cdn.com/20200329/f357f6cbe2291e954d79868ff9607591.jpghttps://uploads.tapatalk-cdn.com/20200329/c2410704ab99b1ae18ab308cd761fadb.jpg

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nuff
29-03-2020, 11:59
Nice 1 mate. Coming on nicely. That’s going to look good when oiled.

smangus
29-03-2020, 17:14
Nice 1 mate. Coming on nicely. That’s going to look good when oiled.

Thanks , need to route round the holes again and sand down quite pleased considering. :)

smangus
03-04-2020, 12:09
Now with 3 coats of Danish oil on and routed out. Showing the pattern nicely. https://uploads.tapatalk-cdn.com/20200403/74954f16b5239f20841a5fe44e2eb3df.jpg

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Marra
03-04-2020, 13:36
Beautiful grain on that wood. Nicely done.

nuff
03-04-2020, 14:19
:clapclapclap: very nice!

smangus
03-04-2020, 19:34
Thanks chaps , have to admit I'm pretty chuffed with it.

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