On Mon, 13 May 2019 20:46:03 +1000, Lucifer wrote:

I did have a one valve test oscillator which was powered by a nine volt
grid bias battery.

Tust the grid alone was battery powered? Seems a bit of a strange idea. I
mean, it's entirely feasible, but if you have to generate higher voltages
for the anode from the mains....





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