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| Photos © Andy Cowley, M1EBV, 2005 |
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Found by Andy (ca. 2005) in a box of old valves at Holsworty
amateur radio rally Tube is 6" high, 1.25" diam. Standard ES base, 2 BA screw terminal on trigger electrode. No markings except for "20 AMP." on the base. |
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Triggered spark gaps are used as high-voltage, high-current switches.
A high voltage pulse is applied to the trigger electrode to initiate
a glow discharge. This provides a current path for the formation
of an arc discharge betwee the two main electrodes. The tube
resistance then drops from open-circuit to a few mΩ. See also. Mike's Electric Stuff / Spark Gaps. |
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© Andy Cowley 2005 |