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Old 15th November 2011, 11:54 PM   #1
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Default Brightest heaters in tubes?

What tubes are known to have really bright heater glow? Tube function doesn't matter (diode, pentode, whatever) nor does heater voltage. What tubes have you seen that are almost like light bulbs?
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Old 16th November 2011, 12:34 AM   #2
tomchr is offline tomchr  United States
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I've always thought that 3C24's were cool looking light bulbs....

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Old 16th November 2011, 01:55 AM   #3
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Hello Tyne,

The 812A has a Thoriated-tungsten-filament and illuminates very brightly but is seldom used in audio work. I have a pair that some day I will play with. These direct heated power triodes were most commonly used in early modulators, AF pwr amps and transmitting RF application back in the 1940's. Mickeystan
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Old 16th November 2011, 02:05 AM   #4
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845 - looks like a light house, very bright yellow almost white, not just a red glow, 10V @ 3A is 30 Watts of glow.
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Ian
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Old 16th November 2011, 06:11 AM   #5
zkri is online now zkri  Croatia
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GM-70. 20V@3A = 60W, almost like light bulb...
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Old 16th November 2011, 12:44 PM   #6
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Quote:
The 812A has a Thoriated-tungsten-filament and illuminates very brightly but is seldom used in audio work.
Most thoriated tungsten filaments are rather bright. The 211 and the 845 light up rather well.

Quote:
845 - looks like a light house......10V @ 3A is 30 Watts of glow.
Actually its 10 volts at 3.25 amps. There is two of them running here. That and the computer monitor are the only lights in the room.

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GM-70. 20V@3A = 60W, almost like light bulb...
The 833A has a 10 volt 10 amp filament for 100 watts, but it also makes a good room heater.
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Old 16th November 2011, 02:09 PM   #7
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Thanks guys! Exactly the sort of knowledge I was looking for.
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