Brightest heaters in tubes?

tyne · 15th November 2011, 11:54 PM

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?

tomchr · 16th November 2011, 12:34 AM

I've always thought that 3C24's were cool looking light bulbs....

Example: Audio Asylum Thread Printer

~Tom

Mickeystan · 16th November 2011, 01:55 AM

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

gingertube · 16th November 2011, 02:05 AM

845 - looks like a light house, very bright yellow almost white, not just a red glow, 10V @ 3A is 30 Watts of glow.
Cheers,
Ian

zkri · 16th November 2011, 06:11 AM

GM-70. 20V@3A = 60W, almost like light bulb...

tubelab.com · 16th November 2011, 12:44 PM

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.

Quote:

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.

tyne · 16th November 2011, 02:09 PM

Thanks guys! Exactly the sort of knowledge I was looking for.

15th November 2011, 11:54 PM	#1
tyne diyAudio Member Join Date: Oct 2011	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?

16th November 2011, 12:34 AM	#2
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	I've always thought that 3C24's were cool looking light bulbs.... Example: Audio Asylum Thread Printer ~Tom __________________ "50 % of the game is mental and the other 50 % is being mental. I've got that part down, no problem." http://www.neurochrome.com/audio

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16th November 2011, 01:55 AM	#3
Mickeystan diyAudio Member Join Date: Jan 2008	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

16th November 2011, 02:05 AM	#4
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	845 - looks like a light house, very bright yellow almost white, not just a red glow, 10V @ 3A is 30 Watts of glow. Cheers, Ian

16th November 2011, 06:11 AM	#5
zkri diyAudio Member Join Date: Apr 2007	GM-70. 20V@3A = 60W, almost like light bulb...

16th November 2011, 02:09 PM	#7
tyne diyAudio Member Join Date: Oct 2011	Thanks guys! Exactly the sort of knowledge I was looking for.

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