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[email protected] pfjw@aol.com is offline
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On Wednesday, April 25, 2018 at 5:17:33 PM UTC-4, Chuck wrote:

The filaments in the finals in WWII tank transmitters ran white hot.
Had an early 20s Crosley radio which didn't have cathodes and the
filaments glowed orange. (RCA WD11s)


Transmitter tubes do tend to run hot. Similar to larger mercury rectifier tubes. In some cases, those had to be shielded (enclosed) due to UV emissions. Back in the day, I ran a 35mm projection set-up that used carbon-arc lights. They were driven by mercury rectifier tubes about 10" tall and in metal enclosures against the UV.

But standard receiving tubes, not so much. And modern microwave oven magnetrons, not at all.

Peter Wieck
Melrose Park, PA