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.
>
>â?¬ The Eimac outline drawing for the 4cx250B shows a much longer leakage
>path.
>
>>In this family of tubes, flashovers commonly occur EXTERNALLY.
>>
>â?¬ 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
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|