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Post subject: 5150 III Combo Gain Problems
Posted: Thu Feb 28, 2019 6:05 pm
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Joined: Thu Feb 28, 2019 5:58 pm
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I was just playing through the blue channel, I noticed when turning gain knob it was scratchy.
Then all of a sudden almost no gain on blue or green channel.
Gain is fine on red.
Bad tube? Which one? Bad pot?

Thanks!!


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Post subject: Re: 5150 III Combo Gain Problems
Posted: Sun Mar 03, 2019 2:46 am
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14045
Location: Province de Québec, Canada
" I noticed when turning gain knob it was scratchy "

Look a dirty pot , use good contact cleaner like Deoxit. Cheap one may not do the job. You must open the amp and look for access hole in the scratchy pot.
Spray in the hole and turn at least 10 time the knob.

Easy to fix by a pro ; If job is well done with good product


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