Playing with 2 Volt valves

[AdrianPH]

I know the past few posts have been regarding Rod valves, but current drain and supply voltage have been mentioned. Now at my end I have minimum fixed voltage of 150 Volts so was driving the one valver with that, so I decided to just use a resistive dropper to get down to the 90 Volt range that I could do with PP3 batteries or a small stack and I am still getting good results down at 90 Volts and the current has dropped to 2.3 mA so around 200 milliwatts consumption and still a reasonable volume in the headphones.

These simple circuits are really impressing me. Will try lower voltages tomorrow.

Adrian