In Reply to: 394A thyratron as a rectifier questions... posted by Pete Millett on August 8, 2003 at 14:18:04:
Pete -The person to speak with about 394A's is Dave Slagle, but I can pass along a bit of his advice. I've been considering them as well for a future project. I'm the voltage drop is 15-20v iirc.
Apparently the "grid as plate" connection is limited as to PIV more than current. About 300-0-300vac input is about max before flashover. Also you want the "birdcage" grid structure for this use or all of the purple glow is hidden :(
With "plate as plate" (or as they were designed) the PIV is around 1250v and current of around 1A is possible.
Apparently a 1K resistor between grid and plate allows a higher piv, but sounds pretty much identical as "plate as plate" hookup.
Lastly, I have test data worked out for a TV7 in both "grid as plate" and native (Thyratron) mode:
TV7/394A:
Thyratron 3.0v HS40000 Shunt 55 A4 cap to plate, will
strike with bias 30-40
Grid as plate 3.0v HS04000 (no connection to plate) Shunt 55 A7, good is > 60
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Follow Ups
- Re: 394A thyratron as a rectifier questions... - Gary Kaufman 08/8/0315:53:39 08/8/03 (1)
- Re: 394A thyratron as a rectifier questions... - Ed Sawyer 16:59:58 08/8/03 (0)