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slimecity 10th November 2017 09:20 PM

Restek Tensor Power Amplifier
Hi there-

Im helping an old fella out with his rather staggering equipment collection.

His cat likes sitting on this amplifier as its nice and warm - Im cleaning it out and giving it a recap to the power modules.

In doing so, I noted there are 2 5.8K-ohm resistors in one module that are getting hot....damn hot, they are discoloured and I will need to replace them.

Problem is that he doesnt have the SM, or access to one. This is one of those companies that keeps these under lock and key. I would like to do the setup procedure to this to ensure that it is running properly. There are FIVE trimpots per power module so guesswork is out of the question!

We are in NZ so sending the unit back to Germany to be "serviced" is out of the question.

Anyone have one they are willing to share, or at least the setup instructions?


vzaichenko 11th November 2017 06:27 AM

1 Attachment(s)
A low-res schematic image, published on the German forum in April this year:
Restek Tensor 1 brummt auf dem linken Kanal, Elektronik (Stereo&Surround) - HIFI-FORUM

You can try to contact its owner there. Anyway, better than nothing ;)


slimecity 11th November 2017 08:33 AM

Thanks Valery!

slimecity 18th November 2017 08:18 PM

I have close to 300mV offset in one channel - the other channel is fine. Any guesses on which trimpot woud adjust the offset? My guess is the 2 x 1K trimpots shown at the left of the diagram. Not sure why there are two of these however - each PCB has 5 x trimpots total. My guess is that the 1k trimpots on the top and bottom of the diagram control the + and - rail voltage (connected to a voltage regulator on each side) and the middle 220ohm trimpot controls the bias. Does this look about right?

as_audio 18th November 2017 08:48 PM


as_audio 18th November 2017 08:57 PM

... but check the output of the voltage regulators also.

slimecity 18th November 2017 10:17 PM

cool, thanks

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