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Post subject: reverb tube socket
Posted: Sat Mar 13, 2010 1:49 pm
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can anyone tell me which is the reverb tube socket in a twin reverb 1975? thanks! Ricstar


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Posted: Sat Mar 13, 2010 2:29 pm
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Look from right to left , it's V3 and V4

The 3rd ( 12AT7) and 4th (12AX7) tubes are used for the reverb


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Posted: Sat Mar 13, 2010 8:57 pm
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Hey Ric, you're determined to try that 12AU7, right? Like Stratele said, V3 & V4 are the tubes. V3 is the reverb driver, it sends a portion of the signal through the reverb transformer and reverb tank. V4(1/2) is the recovery tube for the signal after the tank. V4(other 1/2) amplifies the reverb signal and the rest of the Vib channels signal before it goes on to the phase inverter stage. Just so you have an idea of what the tube swap would change. Have fun! Art

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