Re: Ampeg VH140C

Posted by TheChaplain on May 16, 2016; 6:37pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Ampeg-VH140C-tp30301p30682.html

Definitely some serious weirdness! After troubleshooting until I was swearing at inanimate objects I decided to got a real schematic for the amp.

This is the one I submitted (not my own work)



This is from SLM Electronics (duh) showing the entire preamp section of the amp complete with some test points.



- IC1 is split between the two channels. Why? Shouldn't it be included in the schematic?

- The SLC one has JFETs. There are diodes in the input also.

- Pots (read top to bottom or left to right)
  Gain: 100K rev. audio     CW-C-CCW
  Ultramid: 50KB               CCW-C-CW
  High: 50KL                     CW-C-CCW
  Low: 250KL                    CCW-C-CW
  Vol: 10KL                       CW-C-CCW

- What does IC7A do?

- What does IC5B do?

Sorry for the annoying questions. Im pretty passionate about getting this thing to run