On Sun, 02 Jun 2019 12:56:58 -0400, Pat
On Sun, 2 Jun 2019 15:57:22 -0000 (UTC), Cursitor Doom
What are the typical average/maximum operating temperatures of a full
wave rectifying tube/valve? Is it normal for them to become too hot to
touch after only a minute or two?
I'm talking specifically about the 5Y3GT in this context.
Vacuum Tubes (Valves) work by heating the cathode to "boil off"
electrons. The 5Y3 has a 5v filament that draws 2 Amps. So that's 10
watts even without any current flowing in the plate circuit. So, yes,
I would expect it to get hot quickly.
Ah yes, but you can get far more efficient Sovtek 5Y3GT tubes
which features a filament that draws only 2mA +/- 0.2mA 5V or 10
I like the description on the data sheet:
MINIATURE DOUBLE ANODE KENOTRON IN GLASS DESIGN
WITH OXIDE-COATED INDIRECTLY HEATED CATHODE INTENDED
FOR RECTIFICATION OF COMMERCIAL-FREQUENCY ALTERNATING
That explains why one gets frequent commercials on TV sets that use
Sovtek 5Y3GT kenotrons.
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