On May 12, 7:56 pm, "Antonio Vernucci" wrote:
Thanks for answers

Tony I0JX

But I've also read that the variuos 'command' receivers (BC453, 454
etc,) will work well with much lower B+ voltages.
Which are much kinder on the 60 year old decoupling capacitors etc.
can't remember the value but could it have been as low as 120 volts
DC?
Cos it occurs to me that one could use a 150 volt gas regulator tube
(OD3?) on the output of a power supply to achieve that?