I have a 1960's Canadian Fleetwood AM/FM /phono stereo console..The wird thing is , is that there is a small separatechassis with a power transformer and yet the chassis uses some tubes that would be in an AC/DC set like 50EH5 output tubes...?????

Those tubes were cheap and plentiful, and they could be operated with a 50 volt filament winding. I'm just guessing, but it was not uncommon around that time to see 50 volt power tubes in amplifiers with power transformers. Maybe they would find a deal on transformers and then match tubes to whatever secondary windings. Anyway, good luck with it. Stereo is fun.

:I have a 1960's Canadian Fleetwood AM/FM /phono stereo console..The weird thing is , is that there is a small separate chassis with a power transformer and yet the chassis uses some tubes that would be in an AC/DC set like 50EH5 output tubes...?????
:

:I have a 1960's Canadian Fleetwood AM/FM /phono stereo console..The wird thing is , is that there is a small separatechassis with a power transformer and yet the chassis uses some tubes that would be in an AC/DC set like 50EH5 output tubes...?????
:
The 50EH5 tube had a lot of gain, reducing the need for a preamp in many cases when used with a crystal cartridge. It is true that it was cheap and plentiful, but it was found that it could be connected in such a way that the hum introduced by the higher voltage AC filament was opposite in phase, and camcelled out the hum left by a cheap B+ power supply filter. A transfomer also provided isolation from the AC line. In some phonographs, the 50 volt winding was taken directly off the phonograph motor. Cheap, meets UL standards, but works with adequate power output. EdM