Original plan was to use a 12AT7 for the reverb driver and two sections of a 12AX7 for recovery. In practice it was found two recovery stages was too much reverb. A single stage is MORE than enough. I will probably end up paralleling the two 12AX7 sections for the recovery amp.
The basic circuit drives the reverb from the output of the Cathode follower in the D-loop using a 470pf cap. The reverb recovery is fed back into the grid of the D-Loop recovery amp via a 220K resistor. I also had to do a little shaping of the recovery amps low end response (Rk/Ck) to eliminate a low frequency (60hz) noise that was being picked up by the reverb tank.
Panel Controls,
Loop = Send Bright, Send Level, Return Level and Return Bright.
Reverb Section - Dwell, Level and Tone.
Here are a few pictures of the completed unit. If you have any questions, just ask... Still have a few things to clean up in the wiring.
Gary
![Image](http://glaswerks.com/images/loopfront.jpg)
![Image](http://glaswerks.com/images/loopback.jpg)
![Image](http://glaswerks.com/images/loopinside1.jpg)
![Image](http://glaswerks.com/images/loopinside2.jpg)