02-20-2022, 08:52 AM
Sounds like you have more than just the bad IF transformer. If all is well you should get a loud buzz at the cap of the 75 tube. That needs to be sorted.
The resistance of the ift means very little. What we need to know is the resonant frequency. The set your working on is 448kc but what about your parts set?
Remember the farm p/s? Can't properly troubleshoot the IF stage using 12" clip leads connecting things. It detunes the circuit and allows for stray pickup.
You might want to remove the 6D6 IF tube till you get the plate voltage working. Not having plate voltage but having voltage on the screen grid can damage the tube.
The resistance of the ift means very little. What we need to know is the resonant frequency. The set your working on is 448kc but what about your parts set?
Remember the farm p/s? Can't properly troubleshoot the IF stage using 12" clip leads connecting things. It detunes the circuit and allows for stray pickup.
You might want to remove the 6D6 IF tube till you get the plate voltage working. Not having plate voltage but having voltage on the screen grid can damage the tube.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
