12-22-2014, 06:50 PM
Gee, I wish I knew more about radio!
You won't believe this (or maybe you will). It wasn't the tuning capacitor at all! There was oscillation coming from the wire going from the oscillator coil to the grid cap of a 39/44 tube. I noticed if I put my hand in a certain position, the oscillation went away. To cut to the chase, I turned a screw on an ugly trimmer assembly on top of the coil, and the oscillation went away-- I guess turning the tuning capacitor to a certain capacitance set off the oscillation, and I misinterpreted what was going on! Live and learn? After taking out that capacitor 3 times, and spending a day messing with it, do I feel stupid now! Thanks for your kind attention!
You won't believe this (or maybe you will). It wasn't the tuning capacitor at all! There was oscillation coming from the wire going from the oscillator coil to the grid cap of a 39/44 tube. I noticed if I put my hand in a certain position, the oscillation went away. To cut to the chase, I turned a screw on an ugly trimmer assembly on top of the coil, and the oscillation went away-- I guess turning the tuning capacitor to a certain capacitance set off the oscillation, and I misinterpreted what was going on! Live and learn? After taking out that capacitor 3 times, and spending a day messing with it, do I feel stupid now! Thanks for your kind attention!
