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Post subject: Amp buzz at 0 volume? (1990s Princeton 112plus)
Posted: Fri Jun 01, 2012 10:35 am
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Joined: Fri Jun 01, 2012 10:33 am
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Hello forum.
I woke up this morning and felt like playing for a few minutes. I plugged my guitar into my amp, a 1990s Fender Princeton 112plus.
As soon as I struck the first note, I sensed something odd. I thought it was the guitar's volume pots, yet that wasn't it. Neither was it the effects pedals. I finally unplugged everything and turned on the amp on its own.
The thing was buzzing quite a lot. I though it was the overdrive, yet the clean channel also emitted a noise. Worst of all, turning all knobs down to 0 did nothing: the buzz was still there, although faintly, at 0 volume!
The buzz itself is not obtrusive (won't make your ears hurt), but it is detrimental to the overall quality of the sound: everything sounds kinda muffled, not clear.
So my question is (after checking the sockets around my house), what should I do? What is it I should fix? What is going on with my amp?
Regards and thanks in advance.


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Post subject: Re: Amp buzz at 0 volume? (1990s Princeton 112plus)
Posted: Fri Jun 01, 2012 1:05 pm
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Joined: Fri Feb 05, 2010 4:31 am
Posts: 14050
Location: Province de Québec, Canada
Probably a broken solder in power supply section , a filter capacitor is not connected ( or deffective ) , solder broken at the capacitor.

Look at C47 and C48, the "big" capacitor.

I see that on a Ultimate Chorus, burn printed circuit , fix with solder.


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