I found this as a useful epoxy repair for boards and adhering pads down. It's rated to 500 degrees so it will withstand light and fast soldering. The list below will handle most board repairs we run into with vintage gear short of rebuilding a board thats turned to charcoal. The other option...
I'm in the middle of a Marantz 1122DC restoration and originally noted the amp boards were missing four of the MV-1 varistors listed in the service manual. Once I pulled the board apart I found them on the backside (why?), covered in clear shrink and nasty glue. Looks like they're black and...