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Old 15th March 2004, 06:03 AM   #1
imix500 is offline imix500  United States
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Default Thyratron heater supply?

Hi, I have a JAN 5849 that I'd like to light up for demonstration purposes. Can the filament of a large thyratron such as this be driven with DC? This tube has a reservior heater as well. Normally the two need to be feed with AC that is in phase. Can both be driven with DC? I'm asking because it's available. Thanks!
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Old 15th March 2004, 10:57 AM   #2
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Is it possible that this tube is a 5948 rather than a 5849?

If so, the tube has a 6.3 volt filament. It draws about 30 amps!
The reservior heater operates at 2.5 to 5.5 volts and draws about 5 amps.

Yes, you can operate these filaments from a d.c. supply.
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Old 15th March 2004, 12:54 PM   #3
imix500 is offline imix500  United States
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Default Ah yes.

That's correct, it's a 5948. I knew that it needed around 30A for the filament, and I have an old lab power supply that can supply that. That's a lot of watts, but nothing compared to what it can switch!
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Old 15th March 2004, 05:01 PM   #4
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I've always just stuck a small colored lamp up inside the base and illuminated the 'tube' that way. Works great and with the right lamp, you can get that cool 'hydrogen blue' look!
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Old 15th March 2004, 09:13 PM   #5
imix500 is offline imix500  United States
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That's a good idea. I've illuminated several that way as well, but this one is going to be firing for real into a 200 watt load. The tube won't even know it's there, but it should do fine to show ionization.
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Old 15th March 2004, 10:22 PM   #6
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Then hook 'er up and let it burn.

Hmm, 6.3V * 20A...I'll have to peek at the data sheet and see how jealous my C3J is...

Edit: can't find anything but 5949.

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Old 15th March 2004, 11:07 PM   #7
imix500 is offline imix500  United States
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It's similar, and I'm still searching for the datasheet as well. I have enough info to fire it safely, but the exact specs are always nice to have. I think the 5948's peak pulse capacity is around 50Mw, just a little higher than the C3J.
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Old 16th March 2004, 01:49 AM   #8
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Well the 4959 says 25kV and 500A so 1.25MW... if it's anything like it, then yep! I'd expect more heater power given your estimate.

Would be nice to have a several kA hydrogen thy. for a quarter shrinker.

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Old 16th March 2004, 02:10 AM   #9
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Indeed. Although I don't think other people in my building would appreciate the equivalent of a small EMP device, niether would anything with a silicon junction.
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