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Identify National Plate Choke




 
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Author Topic: Identify National Plate Choke  (Read 349 times)
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W4AMV
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« on: August 30, 2018, 08:10:57 PM »

Good evening.

Can anyone identify this RF choke manufactured by National? I have looked at older publications and catalogs without success. It measured 100 uH, DCR 2 ohms. Looks like it is parasitic free for both series and anti resonances. So a nice choke. Is it pre the R175A series or after? There is a 500 pF 20 kV decoupling cap at the base which will need replaced, appears with a small crack. The p/n off the base of the choke reads GA-1404C. Thanks in advance, Alan


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Bob W8LXJ
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« Reply #1 on: August 30, 2018, 08:51:12 PM »

  Looks like the plate choke used in the ART-13 transmitter

 Bob W8LXJ
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W4AMV
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« Reply #2 on: August 31, 2018, 04:13:16 AM »

Sure does Bob. Thanks. So should be good for a single 813 and probably 500 mA.
Alan
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WBear2GCR
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Brrrr- it's cold in the shack! Fire up the BIG RIG


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« Reply #3 on: September 01, 2018, 11:44:52 PM »

Looks Collins to my eye??
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