Thommessen amp module!!!!!

[VT67]

Dear forum members

Is there anybody out there who has a schematic of the PROTEUS 1.6SW amplifier module from Thommessen? The one I have died on me since the last electrical storm we had.
Music doesn't sound al that good without my active sub.
Thanks in advance.

Walter

[VT67]

Really, NOBODY???

[VT67]

I'm giving this another go! I already contacted Thommessen but they don't even reply.
Is there really nobody out there who tried to repair one of those amps?

Regards

[anatech]

Hi Walter,
Okay, so does it power up? Do you have a voltmeter?
There are only so many ways to make an amplifier. They are then just variations on a theme. What have you done so far to troubleshoot it?

-Chris

[VT67]

Hi Chris

To be honest, the darn thing has been sitting in a cupboard for quite a while now. At the time I did the following:
I replaced a zener diode and the two voltage regulators. The amp works but at a certain level it start to sound distorted. Also before it played much, way much louder. If I replace the op-amps there's no difference. I also replaced the powertrannies, again no difference.
It would be so much easier if I had a schematic of the *******r

Regards

[anatech]

Hi Walter,
I see a pair of large outputs, drivers and a bias transistor in your picture. Possibly that is driven by an op amp, or there may be a voltage amp stage if your supplies are greater than +-18V.
Were the power transistors replaced by the exact number? If not, what where the original numbers?

-Chris

[phase_accurate]

1.)
This would get more attention in the solid state forum probably.


2.)
Have you checked if the output short-circuit protection is working properly. If this sets in too early you cant get max output power anymore.


Regards

Charles

[VT67]

Hi guys

This would get more attention in the solid state forum probably.

O.K, If there's a moderator who's willing to move this thread to the Solid Stage section.

Were the power transistors replaced by the exact number? If not, what where the original numbers?

The exact same devices: Toshiba 2SA1302 and 2SC3281

At the time I have tried to distill a schematic from the amp but I got fed up with it. It's the part of the amp that controls the two relais.

(PM related) Chris, I have two multi meters. I also have a digital scope but I hardly know how to use it. Not much as test equipment hé

Regards

[jacco vermeulen]

Originally posted by GeWa
The exact same devices: Toshiba 2SA1302 and 2SC3281

Walter, the 2SA1302 i have are Green.

[VT67]

Thanks for moving this thread.

Walter, the 2SA1302 i have are Green.

Mine too Jacco

Edit: For some odd reason I can't upload pictures anymore!