[Ron Ramirez]

Another thing to consider: When the Philco 66 was new, the voltage readings were taken with 1000 ohm/volt meters. These loaded down the circuit under test, causing the voltages to appear lower than they actually were. Today's digital multimeters generally have an input impedance around 2 or 3 megohms if not better, and will cause your voltage readings to appear higher than the factory Philco specs even if you adjust your input line voltage to 115 or 110 volts.