25-05-2016, 10:56 AM
Just an addition to post#9:
Suppose the HT line feeding the mixer and IF valves is 110 volts and that voltage is derived from the main HT via a 10k filter resistor and that the combined current draw of those two valves is 11mA, an increase of 2mA current draw will cause the voltage to drop by 20 volts.
If the HT at the rectifiers cathode is poorly regulated for whatever reason then that voltage can change also.
Lawrence.
Suppose the HT line feeding the mixer and IF valves is 110 volts and that voltage is derived from the main HT via a 10k filter resistor and that the combined current draw of those two valves is 11mA, an increase of 2mA current draw will cause the voltage to drop by 20 volts.
If the HT at the rectifiers cathode is poorly regulated for whatever reason then that voltage can change also.
Lawrence.
