1965 Dynaco/Sunn Boost switch

[mitchcolby]

I'm repairing one of the original Sunn amps with separate pre and power amps. The Bass boost is not working and was hooked up in a strange way when I got it. I think it's been modified. Is there a schematic or can anybody tell me how the switch is wired? Thanks, Mitch

[Soundmasterg]

Mitch, there are some schematics here >> http://schematicheaven.net/post70s.html . I am not sure if the schematic is there for the early amp that you have or not. You may find a little more luck here >> http://el34world.com/charts/Schematics/files/sunn/Sunn_Schematics.htm . I believe those amps were the model 60, and they were essentially a very slightly modified Dynaco PAM 1 preamp kit and a Dynaco Mk3 power amp kit all in one box.

Greg