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Plate dissipation specs for 21KQ6
Plate dissipation specs for 21KQ6
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Old 25th March 2010, 05:40 PM   #11
Tubelab_com is offline Tubelab_com  United States
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Sounds like a cousin of 6BK4......Yeah, those beam triodes would be okay for ESLs... Really high mu and transconductance, despite the poor perveance. Not really good for much other than high voltage and pulse regulation!
You guys are thinking about the wrong tubes. The 6BK4 and its relatives were the first generation of HV regulators used in color TV sets. It operated on the secondary side of the flyback and had a typical plate voltage of 25 to 28 KV DC and a maximum plate current of about 1 mA. Running anything that puts 25KV in a vacuum will generate X-rays. For those of us that are old enough to remember, old color TV sets did generate unsafe levels of X-rays, which caused multiple itterations of HV regulator shields, and finally a new design. Except for maybe ESL's they are generally useless.

The 6HV5, 6JD5 and about a dozen others are from the second generation of HV regulators used in color TV's. They operate on the primary side of the flyback transformer and thus deal with pulses rather than HV DC. The theory is that if you limit the peak of the primary pulse you will limit the HV. These tubes operate with a DC voltage on the plate in the 500 to 1KV range and are normally non conducting. They will turn on for a brief instant during the horizontal blanking interval, seeing a peak plate voltage in the 2 to 3 KV range. There is therefore no real linearity requirement.

Physically they look like a big sweep tube with no screen grid. The 6BK4 looks like an X-ray tube!

I did get some sound out of a 6HV5 a couple of years ago. It is not possible to design a simpler amplifier, since it used a power supply, the tube, the OPT, and NOTHING ELSE! I connected my Sony Discman (headphone output) between the cathode and grid, and connected an OPT and a power supply in series between the cathode and plate. I had to dial the power supply up to max (550V) to get any current. The power output was a watt or two and it sounded pretty nasty, but it worked.

I an visualizing ways to stuff these into the red board. Its safe to assume, somethings going to go boom.........
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Old 25th March 2010, 05:58 PM   #12
whitelabrat is offline whitelabrat  United States
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I got a small batch of 6JD5's too out of curiosity and they're cheap. I'll have to figure out how to make an extra safe chassis first. Most of what I've seen so far uses voltages around the 1kv range. Hermetically sealed amplifier?

Before I ever get around to those I've been looking to do some experiments on some 22JF6's. I've got an old bogen PA amp with novar sockets that may get abused.
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Old 25th March 2010, 06:10 PM   #13
Tubelab_com is offline Tubelab_com  United States
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I've seen so far uses voltages around the 1kv range.
I have 1 and 2 KV Kepco power supplies, but they are stored safely a few miles away in my warehouse in case I get the urge to do something stupid. There is currently a power supply on my bench that puts out 0 to 650 volts at up to 1.7 amps. For now I am considering that to be the limit on amplifier sanity. That is where I intend to experiment with these tubes.
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Old 25th March 2010, 07:26 PM   #14
whitelabrat is offline whitelabrat  United States
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High voltage pulse tubes. Class-D output stage anyone? Way over my head. http://www.diyaudio.com/forums/class...class-d-2.html

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Old 26th March 2010, 06:15 PM   #15
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Not low enough saturation voltage, and probably an obscene amount of grid current if you tried. I suppose if you run them at 2.5kV+, you won't mind 500V forward drop, but sheesh... sweep tubes get 50V, and they'll handle the same peak voltages

Tim
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Old 1st April 2010, 05:28 AM   #16
jfitz57 is offline jfitz57  United States
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I just bought 10 29KQ6's for $1.00 each for an ESL amp project. All are Westinghouse tubes in boxes and look new. The plate caps I got with them don't fit! I measured the tube and It is .250 inch. I think I got what I ordered but now I'm confused. Looking around the web for plate caps I see "small" "medium" "large" "6mm" and "9mm". And looking at tube data sheets I see "minature" "small" and "large". So what fits a 29KQ6?

Jim
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Old 1st April 2010, 02:19 PM   #17
Tubelab_com is offline Tubelab_com  United States
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.250 inch is the same size as a 6BQ6GT which is "small".
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Old 1st April 2010, 07:40 PM   #18
TonyTecson is offline TonyTecson  Philippines
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Plate dissipation specs for 21KQ6
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There is currently a power supply on my bench that puts out 0 to 650 volts at up to 1.7 amps.
this is about right for use on P-P 4D32 tubes, do you have them? datasheet says 120w for a pair, would be interesting to find out what those could really do....
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Old 1st April 2010, 08:16 PM   #19
DaveG is offline DaveG  United States
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I bought some of the ceramic plate caps currently available, also small size, and had to pull out the metal and slightly reform it. They were much to tight, so tight I would not force them on, but I'm pretty sure I have the correct size. I assume just loose manufacturing quality. They will work but I am going to keep my eye open for a better style.
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Old 2nd April 2010, 02:57 AM   #20
Tubelab_com is offline Tubelab_com  United States
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I bought some of the ceramic plate caps currently available, also small size, and had to pull out the metal and slightly reform it. They were much to tight, so tight I would not force them on, but I'm pretty sure I have the correct size. I assume just loose manufacturing quality. They will work but I am going to keep my eye open for a better style.
I have had to rebend about half of the ones that I have. They will loosen up after a few hot - cold cycles too. Make sure that the wire is tied or wrapped securely before soldering too. The solder will get brittle over time. You don't want a wire with a bunch of voltage coming loose.
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