"Antonio Vernucci" wrote



If you anyway wish to replace the vacuum rectifier with a solid state one,
using a voltage dropping resistor is a silly way to go, as it would impair
the power supply regulation.

My suggestion is: after measuring the voltage increase you have with the
solid state rectifier, just put an appropriate zener diode in series with
the DC line. The zener diode causes a fixed drop and does not impair
regulation.

If, for your application, a high-power (and hence expensive) zener diode
would be needed, then use the well-known zener diode emulation circuit (a
power transistor and a small zener).

***In the vast majority of receivers that I have come across,the power
supply loading is more or less constant,the main drain being by the audio
output stage which is almost universally a class A amplifier.Hence power
supply regulation is
of no consequence as the load is static.Fitting a resistor will drop a
constant number of Volts,try it and see.

Brian Goldsmith.