RCA recommends 20 volts for the detector and 40 on the output tube. If you use WD11 tubes 1 1/2 volts is the "A" battery.
A schematic can be found at:
http://ww3.nostalgiaair.org/schematics/RCA/_RCA_1-6.gif
Norm
:I have a radiola III and would like to get it into working condition. I have no information on it and am looking for information on the battery voltages. Any resources out there? Thanks,
:Sam