The missing tube would be the ballast, probably something similar to the 49 volt ballast without the pilot tap.
:I bought off of someone a circa early 40s radio which
:says "General Television" on the front but on the chassis it only says "manufactored by Hazeltine" and
:and the only model number it gives is a serial number,
:with the prefix of "CX" followed by some numbers.
:This is a two band radio ( MW & SW ), has a wood cabinet and a handle like a lot of the G T radios.
:The only thing which throws me is that it has a tube
:line up which incluses a 25Z6 rectifier, 25L6 for audio
:output and three tubes rated at 6 volts. There is a 6th and empty tube socket, which I thought might be for a ballast or was just not used ( only two wires go to it ). My main question is if anyone can point me to the Rider service info where a schematic might be found? I don't see Hazeltine mentioned and I have looked at most of the General Television and General Television & Radio schematics and I don't see anything close to this radio. Any help would be appreciated. Thanks, Randall