Home Forums Electronics Restoration Philco 37-650 Plate voltage Reply To: Philco 37-650 Plate voltage

Jean Marcotte
CVRS Member


358V is way too high for that set. According to voltage data on page 7-67, the plate voltage is 250V. You shoud have 265V across filter cap 57. You probably have around 375V there. Don’t let power on too long on that set until you find the trouble. Check the DC resistance of you field coil. It should be 460 ohms. If it is significantly lower, it is your problem. If it is OK then check the resistance of the primary winding of the power transo. It should be 2 ohms. Anything significantly lower, then you have a partly shorted primary. You can also check filament voltage when warm. Anything above the normal 6.3V confirms this.