I have a farm battery radio that requires 2 volts for the filaments of tubes.Is it okay to use 1.5 volt batteries or is this too low or cause cathode stripping etc. If not I could put to 1.5 batteries in series with resistor to bring down to 2 volts.

Hi Chris

Although 2 volt tubes can operate on 1 1/2 volts in audio circuits the radio oscillator most likely will not. Use 2 - 1 1/2 volt batteries in series for your two volt tubes. May need a few ohms in series to drop voltage if there isn't enough drop in the wiring?

Norm

:I have a farm battery radio that requires 2 volts for the filaments of tubes.Is it okay to use 1.5 volt batteries or is this too low or cause cathode stripping etc. If not I could put to 1.5 batteries in series with resistor to bring down to 2 volts.
:

If you were to use two Nickel Cadmium Cells, those are only 1.2 volts each. Would = 2.4 volts. That should be fine for filaments. Not mention rechargeable.

:If you were to use two Nickel Cadmium Cells, those are only 1.2 volts each. Would = 2.4 volts. That should be fine for filaments. Not mention rechargeable.
:Thankyou Norm and Warren for info!!