Chassis picture of a Heathkit FM Stereo Generator Model IG-37
Several months ago I purchased on EBAY the subject stereo generator to help me with some of my home projects. Yesterday I opened up to see the condition. I couldn't believe the craftmanship of the builder thought I would share it with the ZED.
Please see the attached picture of part of the chassis. All the solder joints appear perfect and the workmanship is wonderful. The outside of the case was real dirty, but the inside is near spotless. I powered if up with a variac to about 30 volts for a while and then gradually increased the line voltage to 120V. Some circuits appear to not be working properly, but all the power supply voltages look good.
Assuming all the filaments are lit and all supply volts are good, the next thing I'd look at closely is the tubes sockets as the type used there tend to get a little corrosion and also don't "pinch" the pins as good as could be. You might also just let it run for a day or two to make sure none of the coils have developed a bit of moisture.
Thanks Dick for the hint. I think I should carefully remove each tube from the socket and inspect the pins of the socket and the pins of the tubes for corrosion. With the power off of course.
While you have to tubes out of the sockets, dip them in Tarn-X, Goddard's Silver Dip, or similar liquid silver cleaner. That will get the tube pins cleaned in a hurry.
You can also use one of the silver cleaners applied with a cotton swab ("Q-tip") to clean rotary switch contacts and wipers.