Shorting the emitter and base got me to open circuit, thanks!
I soldered the transistors back to the board, and now the reverb seems to work - bad solder joint? However, once the reverb knob is turned up past about halfway, it oscillates. I checked all the electrolytics in the reverb circuit (which look original) with an ESR meter and they seem okay, so I disconnected the tank and wired in an 8EB2C1B and that seems to work fine, without any oscillation.
So I think my long-term plan is to install RCA connectors to a larger tank housed outside of the chassis. Which is fine since the stock reverb sounds kind of like playing into a metal toilet.
Is there any further debugging to be done, or is it fair to say the reverb tank is at fault here?
~O
I soldered the transistors back to the board, and now the reverb seems to work - bad solder joint? However, once the reverb knob is turned up past about halfway, it oscillates. I checked all the electrolytics in the reverb circuit (which look original) with an ESR meter and they seem okay, so I disconnected the tank and wired in an 8EB2C1B and that seems to work fine, without any oscillation.
So I think my long-term plan is to install RCA connectors to a larger tank housed outside of the chassis. Which is fine since the stock reverb sounds kind of like playing into a metal toilet.
Is there any further debugging to be done, or is it fair to say the reverb tank is at fault here?
~O