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Post subject: 65 Twin reverb problems
Posted: Thu Nov 19, 2009 6:31 am
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Joined: Thu Nov 19, 2009 6:12 am
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My 2004 65 Twin reverb has started to crackle and pop a bit when the reverb is turned up turning it off with the footswitch or keeping the knob turned right down solves the problem, any one got any suggestions before I resort to taking it to the shop!!!!


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Post subject:
Posted: Thu Nov 19, 2009 10:51 pm
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Professional Musician
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Location: Harvard IL
Hi Pat, sounds like you have some arcing going on in the reverb circuit. The primary suspects would be the tubes(V3 and/or V4) ,dirty tube sockets,or dirty reverb control pot. First, I'd rotate the reverb control back and forth a bunch of times. I would try gently tapping or gently rocking these tubes to see if that cause more commotion. If it seems like the tubes are making the noise, then I'd try some contact cleaner on the tube pins.(mark the tube glass and base with a sharpie for reference) If you find that one tube is causing the noise after the cleaning, you can swap it for V1 and test. If it turns out to be V3(12AT7)get a new one, your !2AX7 doesn't have the same current handling capacity, but it's OK for the test. Oh Yeah, welcome to the forum and tube amps. ART

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Posted: Fri Nov 20, 2009 5:26 am
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Mines the same! except its got almost NO reverb too. All the tubes are unbranded in it so im guessing the last owner of it put all 12AXLs in and forgot the unique one for the reverb.

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Posted: Sat Nov 21, 2009 1:00 am
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The PI is a 12AT7 too.


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