Hi, in this instructable i will show you ways to mod your pro-jr to change the sound in pretty much every ways. this instuctable also regroup lots of information
I will cover easy to hard mods, how to bias it properly, route wires to reduce, see remove hum, hiss and oscillation. ADD/REMOVE GAIN and a lot more!
YOU MUST BE LOGGED IN TO SEE INSTRUCTION IN THE PICS(you cant see all of the text if you're not logged in)
Doing these mods WILL void the amp's warranty, if you don't feel confident enough to mod your amp, get it to a tech.
If you do one or some of these mods, you agree to indemnify and hold harmless to the author(ME) if something goes wrong.(see step 3)
Step 1: Open Amp
Follow steps in pics. YOU MUST BE LOGGED IN TO SEE INSTRUCTION IN THE PICS(you cant see all of the text if you're not logged in)
I recommend that you do all of the pcb mods at the same time, i did 'em on 3 times and broke a ribbon cables connection, no big deal. i soldered it back in place and it worked fine.
If after the mods the amp sound bad or even doesn't produce any sound(it won't happen if you are careful), you probably broke the ribon cables connection. Solder it back!