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Post subject: Re: 5150 III Combo Issues
Posted: Fri Oct 26, 2018 12:47 pm
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Rock Star
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Were you civil and respectful with the Fender rep you were communicating with?
That's not a veiled accusation, it's just a question.
It's unusual to hear of someone being cut off from communication with Fender Consumer Relations is what I am driving at.
Just trying to figure out why that might have happened.
If you have in fact been courteous with them and you have a transcript of the conversation it might prove useful if you intend to take the matter further with a third party.

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Post subject: Re: 5150 III Combo Issues
Posted: Sat Oct 27, 2018 8:37 am
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Professional Musician
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What a frustrating experience. I'm assuming you would still like to figure it out.
When you describe the problem as being volume dependent, that places it in the preamp. If your tech went through the amp, we'll assume it isn't an obvious component.
When you describe the problem developing over 2 years, the three things that come to mind are bad solder, a noisy fet and a dirty board.
Lead free solder is continuing to plague high gain amps. Resolder the entire board. Then clean the board thoroughly with pure isopropyl alcohol. There could be residue from factory processes. If you see white residue on the board, it can short out circuits and squeal.
If a tech used the wrong type of solder, the flux can become conductive and cause squeal and buzz.
A noisy fet, Q1,2,3 can easily cause the symptoms. It could also cause the channel popping. Static can punch a hole in the insulated gate. This allows DC the invade the AC signal path causing the popping to occur when the relays switch.
Good Luck


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