Blue Glow on 6ca7 Valve

[JerryT]

Originally Posted by Shian7

Hmmm..... just throwing random ideas into the mix here, feel free to tell me I'm talking out of my @rse!

Noisy track on the volume pot? Any 'rustling' noises when you alter the volume at all?

Worth looking at IMHO, but with the description of pop and rustles I'd be looking at three things. Firstly the RC network across speaker terminals, secondly the feedback connections and thirdly the HT decoupling capacitors. Since the problem is left channel only I think the last is unlikely to be the solution as the HT is common to both channels as far as I know.

Of course a poor earth on the volume or selector circuits could also produce thee symptoms.

More places to look, hope they help!

Jerry

[Malka07]

Shian7 I thought that it might be the volume pot as well, but i changed that a while back to a stepped attenuator..The noise remained.

Jerry, I have changed my kit34 into a poweramp, and my passive only has 1 input and 1 output, so i dont have a selector switch. However your other suggestions maybe worth investigating.

I have changed the feedback resistors, but not the capacitors, i only resoldered them...maybe it would be worth me changing these as well?

Is the Rs network, the resistor and capacitor that are soldered to the speaker outputs on amp? (or am i totaly wrong here?...lol)

And which are the HT decoupling caps?

Thanks again for all your help and suggestions.

Alon.