[ARC5] Filaments - How Low Can You Go?

[Robert Eleazer]

Here is a stupid question for y'all.

Considering that the overall recommendation is to operate the command receivers with reduced B+, just how low can you go on the voltage for the filaments before you have a problem?

With say, 125V B+ and 12V filament power with a command receiver that has 12V tubes and wired for 24V, how well will it work?

In experiments with my first command set, an R-11A, I was astonished that I could get the B+ down to around 28V and it was still working, if rather faint on the audio output. 

Thanks!

Wayne
WB5WSV