PDA

View Full Version : Myst TMA3 problem


Dickl
10-08-2017, 07:24
Hello folks, I've been pointed to this specific forum by someone on a hifianswers forum.

I do a day a week at a charity warehouse and apart from moving wardrobes and sofas I also test some of their electrical items (like usb keyboards) to see if they are working (they then get PAT tested if needed).

Last week a Myst TMA3 arrived and although I hadn't heard of it before it looked as if it was some sort of vintage audiophile amp and that I ought to check it out .

A quick search revealed a few on sale for upwards of 200 quid which would be a good result for the charity if they could get anywhere near that.

I've tried to test it at home but although the speaker connections are working (there is a hum when I turn up the volume) I'm struggling to get anything to play through it.

I've tried a CD and I can just about hear the music but it's barely audible. It's the same on the tuner and tape setting (I can't check the phono as I don't want to dismantle my home set up!). I'm using an old din lead that's been sitting in my cable box (for decades I would think!) but have ordered a new one just in case it's that.

Any ideas?

Many thanks

Dick
walpurgis
10-08-2017, 13:44
Dick. I've moved this from the Arkless Electronics thread, which is trade and for business enquiries.
jandl100
10-08-2017, 15:18
Alan 'firebottle' is the man for this.
He fixed up a Myst amp that I bought and was faulty.
Arkless Electronics
10-08-2017, 15:27
As the OP was erroneously put in my trade section in the first place I'll say I can of course repair this no problem if it proves to be defective.
Firebottle
10-08-2017, 16:02
My first guess is that the DIN lead is connected to the wrong pins, assuming it is a 5 pin DIN.

Often the 'input' pins turn out to be output or back to front as it were. The new lead may cure this.

Alan
Dickl
10-08-2017, 16:18
My first guess is that the DIN lead is connected to the wrong pins, assuming it is a 5 pin DIN.

Often the 'input' pins turn out to be output or back to front as it were. The new lead may cure this.

Alan

Thanks Alan, it looks as if that is indeed the case.

The new din cable I ordered arrived today and it is working! I haven't tested the phono but all other inputs are good.

It's an interesting sound. Very clear with a very flat response. A pity I don't need another amp as I'd be tempted to buy it myself!

Nonetheless the charity will be very pleased.

Many thanks to everyone for their input, I really appreciate it.

Cheers

Dick
Dickl
10-08-2017, 16:20
As the OP was erroneously put in my trade section in the first place I'll say I can of course repair this no problem if it proves to be defective.

Thanks for the offer. If we get anything else of an audiophile nature (rare but it does it happen) I will bear you in mind.

Cheers

Dick
walpurgis
10-08-2017, 17:41
Assuming the charity is agreeable, there's nothing to stop you advertising the Myst here Dick. The Private Exhibitions section is for 'sales & wants' and is free. I'd imagine there may be some interest in it if it's in decent condition.
Dickl
10-08-2017, 20:26
Assuming the charity is agreeable, there's nothing to stop you advertising the Myst here Dick. The Private Exhibitions section is for 'sales & wants' and is free. I'd imagine there may be some interest in it if it's in decent condition.

Thanks I'll bear that in mind. It may be some time as we can't sell anything unless it's been PAT tested and the guy who used to do the PAT testing left and they now have a backlog of equipment. I'm only a volunteer but I've put myself forward for the PAT training and hopefully it won't be too long before they sort it out.

The unit is in pretty good condition. Any guesses for what we could reasonably ask?

http://i1340.photobucket.com/albums/o730/dogsbody99/myst2_zpskxoogesh.jpg

http://i1340.photobucket.com/albums/o730/dogsbody99/myst1_zps47tbtwoi.jpg

Cheers

Dick
walpurgis
10-08-2017, 20:38
I'm not really sure, but my guess would be between £150 and £200. Others may have a better idea. It's not a common item, so I suspect it's anybody's guess to an extent.
Arkless Electronics
10-08-2017, 23:41
It's one of many instances of "the Hitachi circuit" as also used in the Maplin modules... and Perreaux, Incatech Claymore, Musical Fidelity Synthesis and (IIRC) Dr Thomas amongst many others. A pretty nice piece of kit ;)
Scooby
11-08-2017, 01:18
If it becomes available in the next week or so and is working, I'd pay£200 for it. As long as I don't find something else before it's available. Drop me a pm at the time as I don't check in every day.
Dickl
11-08-2017, 07:10
Thanks folks. Much appreciated.

As I explained we're told we can't sell anything without it being PAT tested but I'll see if I can get that clarified or at least get this at the top of the waiting list. I think there is only one person currently qualified and they are a one day a week volunteer like me!

I'll keep you posted.

Cheers

Dick
karma67
11-08-2017, 08:15
hey dick,what charity warehouse in brighton?
Dickl
11-08-2017, 20:14
hey dick,what charity warehouse in brighton?

Martlets
karma67
12-08-2017, 06:07
cheers,if you need a hand with anything hifi give me a shout,im in brighton too :cool:
Dickl
12-08-2017, 09:06
cheers,if you need a hand with anything hifi give me a shout,im in brighton too :cool:

Thanks Jamie, I'll bear that in mind.

Most of the time the types of hi-fi that get donated are fairly standard music systems but just now and again something interesting (like the Myst) comes in. Last week a Thorens TD160 came in (possibly with the Myst I suppose) but we have to wait for that to be PAT tested and I guess I'll probably end up checking if it works at some point.

I should say it's not really my job. I'm retired and I've been doing a day a week there for 3 years and spend most of the time shifting wardrobes and sofas but being a musician I now test any electric guitars and check acoustic guitars for playability and damage. I also know enough about hi-fi to recognise something interesting (not that there is often anything to see!).

Cheers

Dick
Colin Wonfor
17-08-2017, 12:12
The Hitachi circuit was the basic idea but like most of the clones sounded hard and bright, so the wrong component were used I changed that and revamped the circuit, big improvements. Even today this basic circuit is used in a Roxan type amp and many more now with IR FET's and others. But by changing to IR FET's problems on the driver stages have become more apparent.
Today I use a new circuit to drive FET amp with a much more musical sound. I use and did use FET,s in SECA design not based on anybodies design apps notes. And in the new Claymore there is no FET's.

Big SECA like the 300W Mono used 80 FET,s

https://scontent-lhr3-1.xx.fbcdn.net/v/t1.0-9/60223_1598476686062_851611_n.jpg?oh=a6c7d63890d29c 33e0b763a012b92a03&oe=5A2411CA