Separate names with a comma.
http://www.valvewizard.co.uk/heater.html This might help.
The last 4 months, been cleaning up my inventories of junk and parts, so far, four single end guitar tube amp has been completed, yes four amps,...
PT, OT, socket, chassis, tubes (maybe) are the $$$. If its a tube radio, probably some air variable capacitors. Great treasure hunt!
[MEDIA] Probably would help, in this video, the OT also have 25V and 70V output.