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hifi amp, tremolo-like distortion @ volume

wall_of_sleep

Member
Messages
814
I have a small vintage hifi amlifier that is breaking into tremolo-like distortion at volume. Dialing up either the volume or the bass affects the rate and severity of the distortion.

The amp works great to about 75%, so I don't want to tear into it without a better idea of what the cause may be. Thanks.
 

pdf64

Member
Messages
8,068
Yes, the vintage electrolytic caps are likely to be unfit for purpose.
Time to replace all electrolytics.
Pete.
 

wall_of_sleep

Member
Messages
814
I completed a full cap job on this amplifier and am still getting the motor boating on the magnetic jack channel at around 50% volume. There is also some hum that goes off and on with pressure on the 6sc7.

Will continue troubleshooting, but am welcome to any suggestions.

 






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