[AMPS] Zener screen supplies

[Ian White, G3SEK]

measures wrote:
>
>>
>>Message text written by INTERNET:conrad.farlow@virgin.net
>>
>>>How did the insects get inside the tubes?<
>>
>>This must be the troll of all time. Small 4CX tetrodes have EXTERNAL anodes
>>and also EXTERNAL screen rings, separated by a few millimetres of ceramic
>>insulator. 
>
>€  The Eimac outline drawing for the 4cx250B shows a much longer leakage 
>path.  
>
>>In this family of tubes, flashovers commonly occur EXTERNALLY. 
>>
>€  I have never experienced an external arc,  John.  "A few mm" appears 
>to be off by a factor of c. 9.  

Enough of these non-standard units! The last time I used the arc method
to measure the length of the gap on a 4CX250, it was 1.0 earwig. 

73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                          'In Practice' columnist for RadCom (RSGB)
                           http://www.ifwtech.com/g3sek

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