Hello again.
I've been meaning to get an amp on the bench which needs attention in the reverb section...today's the day! I've always been in the dark about this circuitry but after reading a bit, I think I'm getting more comfortable...Basically the input signal does this: input signal preamp > reverb driver stage > output transformer > tank > preamp recovery stage > mixing with dry signals and onto the phase inverter. Sound about right?
I was wondering if someone can point me in the right direction of diagnostic tips for typical dead reverb problems.
Today I'm dealing with a non-dead reverb..well..sort of. I've got a re-issue Deluxe Reverb here which does not reverberate the dry signal. However, the tank does work, as it is able to pass mechanical vibrations (tapping) into the amp. When the reverb is activated the tank picks up the idle noise and hiss from the amp, or mechanical vibrations from playing at loud volume. It reverberates all these noises but not the input signal. Furthermore, when you crank the reverb control the unit starts to feedback. The feedback ramps up very slowly, maybe over 15-20 sec. This feedback can only be silenced by reducing the reverb control.
The tubes test OK, and I've got a scope on hand if that helps.
Thanks!
adam
I've been meaning to get an amp on the bench which needs attention in the reverb section...today's the day! I've always been in the dark about this circuitry but after reading a bit, I think I'm getting more comfortable...Basically the input signal does this: input signal preamp > reverb driver stage > output transformer > tank > preamp recovery stage > mixing with dry signals and onto the phase inverter. Sound about right?
I was wondering if someone can point me in the right direction of diagnostic tips for typical dead reverb problems.
Today I'm dealing with a non-dead reverb..well..sort of. I've got a re-issue Deluxe Reverb here which does not reverberate the dry signal. However, the tank does work, as it is able to pass mechanical vibrations (tapping) into the amp. When the reverb is activated the tank picks up the idle noise and hiss from the amp, or mechanical vibrations from playing at loud volume. It reverberates all these noises but not the input signal. Furthermore, when you crank the reverb control the unit starts to feedback. The feedback ramps up very slowly, maybe over 15-20 sec. This feedback can only be silenced by reducing the reverb control.
The tubes test OK, and I've got a scope on hand if that helps.
Thanks!
adam