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Post subject: Noise in reverb on a '65 RI Twin Reverb
Posted: Fri May 28, 2010 10:11 am
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Hi everyone, ever since I moved to my new house, I'm getting "interference" in the speakers of my Twin Reverb. I can only describe it as a "thunder" sound, while it sounds cool if I was playing Riders on the Storm, it doesn't sound good at other times, I'm thinking that they are electrical surges, does anyone know of a remedy?
-Brett

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Posted: Fri May 28, 2010 2:15 pm
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Hi,

Do you have noise when all pots are at 0?

Tissan


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Posted: Sat May 29, 2010 9:32 am
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Hi, no, the noise goes away, it sounds like something is hitting the reverb tank

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Posted: Sat May 29, 2010 3:43 pm
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Hi,

If your amp is still under guaranty --> bring it back to the dealer.

Otherwise

Remove V4 (reverb and direct signal mixer) if no noise the problem is located in the reverb/tremolo circuit
Try another reverb pan
Test an new V3 12AT7 (12AX7 with low gain = ECC81)
Test a new V4 12AX7
Just have a look if you see a capacitor-resistor unsoldered or burnt in the reverb circuit

Let me know if you have electronic skills

Take care high voltage that can even kill you

Tissan
:shock:


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Posted: Sun May 30, 2010 9:37 pm
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First thing I would do is let the tubes cool right down (tubes burn when touched right?) and with the amp switched off at the wall completely remove and reseat all the tubes. It is obvious test after you have moved the amp and notice somethings wrong.

Next you can try gently tap testing with something wooden or plastic that won't melt against the tube (hot) when the volume is up a bit. This can show if there's a micro-phonic or failing tube. Another thing is a visual inspection to see if ones dim or going supernova (compare against same tube type).

Next is try the amp with a different guitar and cable (no effects - direct to the amp) at a different house.

If you have access to spare or old working tubes swap test. If not its off to the repairer for you unless you like electronics and exposing yourself to dangerous voltages.


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Posted: Mon May 31, 2010 3:38 am
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No guitar plug ,you have the noise ?

You have to be sure is not the guitar.


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Posted: Tue Jun 22, 2010 2:40 pm
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I reseated the tubes, problem solved!
Thanks Shockwarrior, damn good thinkin!
Thanks to all who replied
- Brett

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