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Fri, 01/02/2015 - 08:28
#1
Cooljazzer

112 RD50 distortion

Severe distortion at all volume levels traced to short circuit Zener D9 in bias circuit causing R62 to go open circuit. Sounds great now.

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Mon, 01/05/2015 - 16:57
inertian

Seems to be a common failure

Seems to be a common failure point for these amps, I've only seen a few operational RD50s that still had their original zener and resistor intact.

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