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4hv.org :: Forums :: General Science and Electronics
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Looking for an ignitron datasheet

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Dalus
Thu May 26 2011, 11:53AM Print
Dalus Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
 		I've found a few of these ignitrons but wasn't able to find any information on them.


1306410666 639 FT1630 004


Does anyone have the data sheet or any information on these. I'm planning to use them as a switch in pulse capacitor bank.
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Proud Mary
Thu May 26 2011, 01:05PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Va = 20 kV. Vtrig = 1.5 kV.

Here is a link to a NASA Technical Note of May 1965, which looks right up your street:

CHARACTERISTICS OF A 5-KILOJOULE, IGNITRON-SWITCHED, FAST-CAPACITOR BANK
By Charles J. Michels and Fred F. Terdan

Link2

You'll notice that the NASA invention uses a General Electric ignitron type GL 7703, whilst yours is the Westinghouse version, WL 7703.

Interestingly, in true 4HV style, the NASA team are determined to over-volt their ignitrons at 30 kV, 10 kV above
the manufacturers Vmax 20 kV rating
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Dalus
Thu May 26 2011, 01:20PM
Dalus Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
 		Thanks a lot. Already have dedicated triggering psu's for them and about 12 of these devices. Seems they are of use for my application.
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Dalus
Sun May 29 2011, 03:51PM
Dalus Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
 		Found out a few of them are destroyed can hear the parts of the rattling. Doesn't sound like just the mercury in the others frown
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Proud Mary
Sun May 29 2011, 06:36PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Oh that's a shame, Dalus!

But you could still go ahead and make your own triggered gaps now that you've started to think about it.
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radiotech
Sun May 29 2011, 07:21PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
 		7703- Pulse igniton-Peak Fwd 20 kV.Peak Anode 100 kA. Mean
Anode 0.75 A. Ampere-second per pulse 10 A.s..



,
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Dalus
Sun May 29 2011, 10:10PM
Dalus Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
 		Luckily I do have 8 ignitrons that are in good shape. They measure fine and are able to strike an arc when triggered. Using them would be less of a hassle then building my own triggered sparkgap. I'll be using them at a relatively low voltage for normal sparkgaps. Only way to make a proper triggered gap is to use multiple segments which greatly adds to the design complexity.

Thinking of them they are amazing devices especially for the time that they where used in. Would like to put them to good use again. Seems a shame not to use them.
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radiotech
Mon May 30 2011, 01:41AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
 		Here is a scan of my datasheet on the 7703
1306719710 2463 FT116433 7703
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Dalus
Mon May 30 2011, 09:43AM
Dalus Registered Member #639 Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
 		Thanks radiotech. Some of the datasheet books where lost in the lab. Luckily others do know where to find them smile
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Proud Mary
Mon May 30 2011, 11:15AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		This paper describes the important procedure for conditioning an ignitron that has been out of use for some time:

Link2
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