I want to add a headphone jack to an old solid state amp I have with a decent tone. I pretty much just want to use this to record quick demos without setting up mics for my tube amp. I don't think this would be as simple as adding a jack to the speaker wires, anybody know how this would be accomplished?
Adding to the speaker wires would be bad because line recording current is in milliamps, so you would fry your recording hardware. Recording output is almost always from the preamp section because of this, in which case it may be difficult to do on a SS, I'm not experienced enough on modding amps to help any further.