I'm in a bit of a predicament and I need some help. I was trying to unscrew the pcb in my amp from the chasis, but the screws were in so tight that one ended up getting stripped, and is still firmly in place. As a result, I don't want to try to force it out, because it could (and with my luck would) wreck the board. So essentially, I'm forced to only work with the top of the board. My idea is this: I want to change a resistor value on my amp from 220k to 100k, and I'm wondering if it's possible to clip the leads of the current resistor super close to the resisitor itself, and to solder the new one onto those wires. My questions: Will this work? Will it sound alright, or will the sound be degraded? If I do a bad solder job, what will happen to the amp and what will happen to the sound? What will happen if the connection is cut compeltely? The resistor is R7 in the following schematic: http://www.blueguitar.org/new/schem/misc_amp/crate_v16_palomino.pdf It is off of pin 6 on v1b Side question: what is the part optc39 that says DO NOT INSTALL? I noticed that it was an empty space on the pcb as well.