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Kind of late on this thread, but I want to say this for the people that wil read through. I am pretty sure his second mark iv's preamp is bypassed and the signal is routed in through the effects return. This enables him to have his stereo rig. He only uses the first preamp of the top mark iv...

Alright great info right there. Yea it would also be much easier to fix in the future if their top side since theyre kind of hiding under the board. I've never soldered anything before but do have an iron.. I might bring it to a good tech near by. I know its not very difficult but I'm a little...

Ok nice.. thanks for the reply. So do you think the resistors are damaged by overheating and aren't within tolerance anymore? Or re-soldering should be enough to fix the problem?

Alright sounds good. Its amazing that this little resistor can cause so much mayhem in the amps operation. Hopefully this is the only thing causing the problem.. Thanks for the input again.

Here are the pics.. The two black pieces are the things to look at. They are wired to the power tube circuitry. Notice how the bottom one is detached on the right side. This can't be good right?

I'm gonna take a look at the internals again tonight. If i remember correctly it was near the back above a power tube. Also I swapped the preamp tubes and changed power tubes with no difference in sound.. also plugged the reverb back in. Something I noticed while swapping power tubes was that...

Hey thanks for the ideas.. ill makes some tests and post some pics. To answer some of your questions, the preamp tubes are about a year old at this point so I don't think its them but there is a slight hiss and crackle on high gain channels so it is possible some have gone bad. When playing loud...

Hello everyone.. I have a strange problem with my rectoverb solo 50 v2. The major problems are when I play the amp loudly ( i.e. channel 2 master at 9:00 and output at 11:00 or higher) the tone is so bad that the amp is useless. It becomes very flabby and weak, also the crunch of the distortion...