Negative Voltage Doubler for bias supply of Sound City amplifiers
Right click and save-as the image for full resolution
This is based on information found on various forums about Hiwatts and such. I put this voltage doubler in a 1973 Sound City Concord combo, which is very similar to the other Sound City "50" series amps. This is also the same simple bias supply found in the Hiwatt 504.
Copyright © 2018 Zach Weeks. All rights reserved.