Re: [htw] the warm, mystical, primordial glow of the vacuum tube filament....
> That's a good point. I wonder how the relative thermal contribution of
> filament and plate breaks down. I've seen RF amplifier tube plates glow
> dull red (big Eimac tubes), but that's not the norm. Do the plates in audio
> amp tubes get all that hot under normal conditions?
Yeah, and sometimes they'll glow, though they're not supposed to.
There was a breed of low-profile amplifiers that used a sort of
miniature high-power audio output tube called the 6BQ5, and these
usually wound up running red-hot because the designers wanted more
power out of the tube than it could really handle. Wasn't much power
anyway--maybe 15W per channel, but that's a lot for a pair of
miniature tubes.
are these relevant? they are $6 and under. (i wish they reported lumens or some such.) http://www.lightbulbsdirect.com/page/001/PROD/HalogenBT15/H100BT15WH ...
... I have some similar lamps provided by our local power company quite a few years ago as an energy saver. (Now they push the compact fluorescent lamps.) The...
Yes, I remember Reddy Kilowatt. Reddy was created by the Alabama Power Company. Other electric utilities had to pay a fee to use him. Southern California...
Ah, the warm, mystical, primordial glow of the vacuum tube filament.... http://www.wired.com/gadgetlab/2009/07/vacuum-tube-chess-flickers-and-glows/ [Non-text...
... I believe the flame proof stuff is Nomex _________________________________________________________________ Insert movie times and more without leaving...
... Those would be LED lamps inside, and I imagine the tubes themselves are plastic re-creations. Nobody would know that tubes were hot, or that they only...
In the photo, the orange ones looked pretty real, although I wondered how they got the blue, unless they were all recreations of OA2 regulators with a slightly...
I would imagine that the tubes don't get that hot with only filaments lit, since there would be no plate dissipation as there would be in actual operation....
From: "Joel Phelps" <joel_ph_elps@...> ... Yep, Nomex is flame retardant--but it doesn't do squat for insulation, nor is it very strong. Raku gloves...
... Now and again I have seen guitar amplifiers and other audio equipment with either bogus or inoperative vacuum tubes. It's a matter of marketing. No, the...
... 12AX7 - dual triode. Filament = 12.6 V 0.15 A (or 6.3 V 0.3 A) Plate dissipation = 1.2 W each side Filament only = 1.9 W; full load = 4.3 W I remember that...
... That's because it is a fashionable tube, used in (cough) high-end tube-type audio amplifiers along with the 6L6. If you only know enough about tubes to be...
... Yeah, and sometimes they'll glow, though they're not supposed to. There was a breed of low-profile amplifiers that used a sort of miniature high-power...
That's easy enough to find out. Let's look at the data sheet for a 6L6 heater volts 6.3 Heater current .9 amp Thats 5.67 watts. maximum plate and screen...
From: "Mark Kinsler" <kinsler33@...> ... That's just... sad. Y'know, that sort of information leads me to wonder whether the doomsayers aren't correct...
The miniature tubes were the 7 or 9 pin tubes that came out after the octal socket tubes. The ones with the wire leads found in hearing aids and some...
It may or may not be true, but I heard a story once, way back in the Cold War there was a Russian Jet-fighter pilot who landed at a Western base looking for...
Yep, it happened: http://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-25 I would expect that the vacuum tubes were more an example of Russian engineers using...
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