On 10/6/2015 3:50 PM, gregebert wrote:
I dont know if it's still common practice, but many radios and small TVs in the US in the 1960's & 1970's had a 'hot-chassis' where one side of the AC line was connected to the metal interior chassis. Obviously, these devices had non-conductive (usually plastic) cases. Polarized cords supposedly ensured the neutral side was connected to the chassis, but extension cords etc left it a 50-50 chance it was electrically hot. I cant recall if any of these were UL listed, or not.Those chassis IIRC were insulated from the cabinets with nylon/plastic bushings. I think even the control shafts were also insulated from the chassis just in case one of the control knobs came off.
Except for the audio output tube which had a "50" volt filament, e.g. 50C5 or 50B5. IraYou would think that if hot-chassis devices were "safe", then usage of a pseudo-isolation transformer would be safer. I was probably 12 years old when I opened-up my first hot-chassis radio (yes, it was unplugged) and couldn't believe my eyes when I saw the power-connector tied to the large all-metal chassis.And for you vacuum-tube enthusiasts, you may have wondered why there was a tube with a 35-volt filament (35W4). That's because the filaments were wired in-series to the AC line, and the remaining tubes had 12.6-volt filaments.
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