The Bug is back

[Bksabath]

Attachment 28590

Pictures are not that good
I am lacking the skill of many in this forum …

[Bksabath]

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Time to finish the front panels

[Bksabath]

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I left it for last the last bit of drilling for the transistor mounting


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I am using 2 M5 bolts the kerafol Keraterm 86/82 I am using is good for 60 Nm and has a thermal conductivity of 6.5 W/mK

Same time ago I was looking for CVD Diamond and at the time it was not made for this application now is available under the trade name Diafilm TM220 whit a conductivity of 2200 W mK (is it real)

Either I win the lottery or they decide that I had a good idea after all


But any way compare a M5 bolt to the M3 screw and think about it

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That is where the thermistor go right against the squarish tab camming out of the moss fet body there will be same sort of heat shrink around both to maintain contact

That is the hottest spot nearest to where all the switching happens


I seen them all over the place from open air to near the penny washers normally used to fit the dudas

[Bksabath]

Nearly 18 K view's on this tread
Constructive comments are welcome

+ If any one is interested I can arrange for a group buy for the PCB's and any bits and pieces


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One off the 3 box set up

They are big

[Bksabath]

well over 18K views on this tread
I feel that I am letting you down
Thing is I got a new toy today after waiting for over a month for it to be delivered

I am Waiting for HiFI Dog to pop around and lend same moral support as I am so scared to mess it up when fitting it to the V
Will let you know how it sounds later 1.1 mV output on the Paradise ???
And if not the paradise will it overload the XP10?
But then the F5 need same serious output to be driven DSCF2653.jpgDSCF2655.jpg

Later …

[Bksabath]

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Just the last hurdle
I am matching up 300 Mosfets
I may be same time


But I am going to take the rest of the day of
I got a bottle of amarone and a new toy for my birthday



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[maximax]

Hi, if you don’t mind me asking - those heat sinks with the wave profile:

Where did you get them from? Price? Thanks!

[Bksabath]

maximax welcome to AOF
It all depends on what and how you using them for
send me a PM whit more info
In the mean time

http://www.abl-heatsinks.co.uk/index...ct&product=204

https://www.gdrectifiers.co.uk/uploa...S685_PS835.pdf

Here is a link or 2
I got the ones from link 2 on this build
In regard to price all I can say is quite a lot
I have not tried them so far but I can say based on experience that the 170 X 300 is good for twin (2 + 2) mono blocks at 770 mA Bias or quads (4+4) Monos at 770 mA but whit cooling (link 1) £35.26 each

One thing I can say for sure is that I can not see how the specified parts (on another forum) can possibly work but apparently they do maybe it is all due to the TO3 being fitted whit a single M3 screw and washer

My old F5 whit over the top sinks and cooper diffusers (400 x 300 single sink 4 mosfets biased at 1200 mA each) run pretty cool till one try a mate Polk cobra speaker cable they get pretty hot on a 3 / 4 hour session but sound so good
If you get a chance the Cobra is the best speaker cable I have ever tried but it may kill your amplifiers

[maximax]

Belatedly many thanks for the detailed response. I was aiming to build the sit-3x and a passively cooled Hqplayer PC. However, I have a feeling that work will sidetrack me next year. Anyhow, the development of the sit-3x appears to be dragging on, so no rush.

Those folks even sell a 10cm deep heat sink:
https://www.bal-group.com/heatsink_detail/240
No idea about prices.

[Bksabath]

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Just matched 200 FQA1920C and got lucky whit this batch any of the rows is matched at 500 mA at 50 C
The I run a test whit the DCA Pro DCA75 and pick the 4 s' I need

I still have to do a couple more runs on the FQA12P20 batch

I have same spares if any one is interested

I decided to get the trafos as well before brexit just in case I had to pay import duty on those

What no one told you that you will have to pay taxes when you buy stuff from the EU during the referendum campaign?

I got a couple of 800 VA 28+28 V toroidy supreme on the way the DC voltage on the rails should be around 38 V say 28 V RMS = 200W on 4 Homs
The 800 VA will not flinch at running 14 A





Sit X3 love to ear it when is done
Yes was looking at that sink as well If i remember is not wavy surface area is what matter are you going to force cool it whit fans ?