Phoenix Gold M50 | DC Voltage - Popping Crackling Noise

Morning all,

I have Phoenix Gold M44 and M50 amps.
I am using M50 amp for midwoofer.

I know, PG typically does not release documents.
For M50 , Even no music is playing, I can hear a crackling sound from speakers if they are connected to the speaker terminal. It still does it with the RCA’s unplugged so Speakers connected but no rca signal. We measure each channel (L and R) voltage. DC voltage is not under 50mV. I think 50mV is still considered acceptable. Problem is continue for both channels. We hear turn on and or turn off pops too. The m50 is a powerful and beautiful sounding amp if it’s working properly. Would you support us on this matter?

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I need olsa Gain Pot. Nobody makes that 50K c taper pot anymore. I try to rebuilt them and clean them.

It would be great if there was a schematic diagram. Does anyone have such a file on this subject?
 
I am not certain how to express my gratitude for this wonderful attachments you shared.
I think it was impossible for me to find this.
Thank you for your effort and time.

If we can salvage the M50, it will be on this board. Can't wait to hear back. I'll keep you posted.
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