I modified the circuit of the battery amp to put the volume control before the first stage like the original FET version of the amp (one of the first posts). It really doesn’t sound that different – It just allows you to have really high output input sources without overdriving the first stage. It is very easy to modify the original board layout to do this. On the final stage, I also modify some values because of the altered gain distribution.
Here Is The New Schematic showing what needs to be modified:
if you compare to the last version – its not that different.
Here is jazz demo with some compression from my simple opto-compressor and the amp set with a little mid size room reverb and mid way settings on the Bass, Treble and Presence. The guitar is a cheap beater electric that cost me $150.00. It is always fun to see if you can good sound out of crappy guitars!
Note: In the this schematic and layout below, I changed one of the select lines for the FV-1 to use a different reverb algorithm – not a big deal – I just like it a little more than the original.
Here is a new board layout that requires no modification and reflects the new schematic exactly:
Here is the schematic as shown above but without any references to modification: