Quote from: g1 on November 23, 2016, 02:20:31 PM
The diodes and nearby power resistors are nothing to really worry about. I would clean off the old solder and re-solder them with fresh solder. Their job is to regulate voltage by converting excess voltage to heat. If you really want to replace them, you can raise the new parts off the board a little so less heat gets transferred to the board.
As far as the hum, did you use the exact same replacement jacks? Did you triple check your work & check for any cracked traces or pads going to the jacks?
Thanks for the info on the diodes! As for the jacks, I ordered them from a company called Studio Sound Electronics. They don't look exactly like the old jacks I pulled out--the old ones had a clear plastic top--but the pin configurations match and that was the part their site matched to mine. I'm fairly new at soldering but I thought the jacks came out well enough. Pic below shows the connections. Excuse the flux splatter--I'm still getting the hang of soldering.
I'd actually replaced 3 jacks. Inputs 1, and 2, and the foot switch jack. Input 1 had loose solder connections from years of use and 2 basically shattered when I was putting the front facing nut back on after blowing out the pots (combination of using a nut driver, over tightening, and old, brittle plastic). As far as potential problems, I had 1 issue with Input 2. In the photo, it'll be the lower left pin of the left jack. There was a metal o-ring conductor that sits on the board that the pin goes through. It came off when I heated it up, though I was able to get it placed and soldered back in. The traces seem to be okay. I tried not to leave the heat on in any one spot for too long.
I'd love to figure out the hum issue. It's a nice old US made solid state amp...and I'm the only one who has ever owned it.