Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Enzo So that's what "special" means...... -- 8/30/2004 12:16 AM View Thread

Re: Silvertone Reverb

8/30/2004 5:24 AM
Dr. Photon
Re: Silvertone Reverb
The reverb seems to have a floating driver that is connected to the plates of a 6CG7/6FQ7 (essentially a 9 pin 6SN7....) that is set up as a phase inverter/differential driver. You are getting a differential, relatively high impedance signal here. It shouldn't be floating at a high voltage potential due to the coupling caps, but only one side has a resistor to ground. I would suggest (if you really care about this...) that you get a tank with an isolated input (the input's ground is NOT tied to the reverb tanks metal case) with an input impedance of around 1.5K. The reverb recovery stage should be able to work with any kind of reverb unit (jockeying around with the gain of the recovery stage by modifying the values of the resistors around it might help you . All accutronics tanks have the same reverb pickup units it seems - only the spring configuration and input driver differ. If the amp's differential high impedance reverb driver fails to drive the high impedance tank worth a crap, you can just rebuild the section around that 6CG7. I'd just parallel the triode sections and make a capacitor coupled reverb driver ala Ampeg into a high impedance tank. You could also grab a transformer and use a low impedance tank.

Tracy Thanks Dr photon. I've been loo... -- 8/30/2004 4:38 PM
Greg Simon Any suggestions for mods? -- 9/2/2004 10:06 AM