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Floyddroid
11-06-2018, 05:32
A good friend of mine has a very frustrating dilemma and in need of a vintage audio specialist who can repair his Denon PMA 850 amplifier. At the moment it is suffering from a lot of distortion. The obvious candidate i.e. Jez can't do it. So in need of someone to take up the challenge.
Firebottle
11-06-2018, 06:09
It's well within my capabilities Steve, so that's one option.
Floyddroid
11-06-2018, 16:07
It's well within my capabilities Steve, so that's one option.

Excellent.
oldius
11-06-2018, 16:38
Mike Powell in Bolton has serviced and recapped mine to excellent effect.
337alant
11-06-2018, 20:53
Steve
I presume this is Neils amp ?
If its still playing music and has distortion on the old denon I would start with cleaning all switches and pots
If that doesn't cure it I can have a look at the circuit boards
I have deoxit so Ill tell him to bring it up on Wednesday

Alan
oldius
12-06-2018, 05:09
Sometimes with amps of this age, the switches that are not used (typically tape monitor) corrode. Activating them multiple times with, the power off, often works.