12-27-2013, 10:57 PM
If you are measuring across the 1st IF transformer compensating capacitors then you will get an open indication on the primary because this cap is not directly across the winding. The primary is also part of the autodyne oscillator circuit. The secondary compensating cap is directly across the secondary so you should get an indication there.
The voltage on the 44 RF stage plate and the 36 converter plate should be about the same as they are both fed from the same B+ supply decoupling resistor. If the 36 plate is significantly lower, then something is wrong with the IF primary or the oscillator winding as they are both in series with the plate B+ supply.
You can try checking for oscillator output by placing a transistor radio near the osc coil, tuned to a freq 260 KHz higher than the Philco's dial freq. You should hear the carrier as the dial is tuned if the oscillator is working.
The voltage on the 44 RF stage plate and the 36 converter plate should be about the same as they are both fed from the same B+ supply decoupling resistor. If the 36 plate is significantly lower, then something is wrong with the IF primary or the oscillator winding as they are both in series with the plate B+ supply.
You can try checking for oscillator output by placing a transistor radio near the osc coil, tuned to a freq 260 KHz higher than the Philco's dial freq. You should hear the carrier as the dial is tuned if the oscillator is working.
