07-22-2024, 08:29 AM
Hi Matt,
Lets have a look over in the p/s and see what cooking over there. Measure the dc voltage from the chassis to the bottom of #32. Should see about -16v. Measure the top of #33. Should see about 250vdc+. This is the HV rail and if you follow it thru the circuit more than likely you can find the failure. Common plate voltage would be 200-250vdc except for the 80 and the 24 det tube. Screen grid voltage 75-100vdc but it's going to vary w/the volume control.
Common fails are rf coil pri/no plate on 24A plate, leaky/shorted caps in the HV rail, and out of spec resistor.
Happy hunting!
Lets have a look over in the p/s and see what cooking over there. Measure the dc voltage from the chassis to the bottom of #32. Should see about -16v. Measure the top of #33. Should see about 250vdc+. This is the HV rail and if you follow it thru the circuit more than likely you can find the failure. Common plate voltage would be 200-250vdc except for the 80 and the 24 det tube. Screen grid voltage 75-100vdc but it's going to vary w/the volume control.
Common fails are rf coil pri/no plate on 24A plate, leaky/shorted caps in the HV rail, and out of spec resistor.
Happy hunting!
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
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