02-08-2019, 12:12 PM
Tom,
Great job rewinding the coils!
If the plate and screen voltages of the RF (44) and the Det/Oscillator (36) tubes are low, you probably have resistors that need to be replaced.
The resistor that will affect the plates of the 44 and 36 tubes is component #20. This should measure 5000 ohms. Many resistors drift high over the years, so check that resistor (and probably replace it if it is more than about 10% high).
The screen voltages of these tubes are controlled by the resistor divider composed of components #47 and #48. These should measure 51K and 39K ohms respectively. If either, or both, of these resistors have drifted significantly, the screen voltage will be affected. You probably need to replace these as well.
Good luck
Great job rewinding the coils!
If the plate and screen voltages of the RF (44) and the Det/Oscillator (36) tubes are low, you probably have resistors that need to be replaced.
The resistor that will affect the plates of the 44 and 36 tubes is component #20. This should measure 5000 ohms. Many resistors drift high over the years, so check that resistor (and probably replace it if it is more than about 10% high).
The screen voltages of these tubes are controlled by the resistor divider composed of components #47 and #48. These should measure 51K and 39K ohms respectively. If either, or both, of these resistors have drifted significantly, the screen voltage will be affected. You probably need to replace these as well.
Good luck
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