AC Line Voltages, Then and Now

[Tom in N Texas]

doc and Gentlemen,

a) I would expect semiconductor rectifiers to be more vulnerable than tubes 
to EMP. The soft-start device would probably degrade overall EMP 
susceptibility. The components visualized in the other suggestions seem to 
be less susceptible, or are intended to reduce susceptibility.

Engineering design is a game of trade-offs. The individual designer/team 
would have to decide on an optimal design.

73 KC5INU Tom in North Texas
------------------------------------------------
At 04:16 PM 5/12/06 , you wrote:
>>... reduce vulnerability to ... ElectroMagnetic Pulse (EMP).
>>a)  Replace tube rectifiers with plug-in semiconductor rectifiers. A 5U4 
>>rectifier pulls 15 Watts out of the filament transformer, and all of that 
>>heat has to be gotten out of the unit.
>
>Are these two goals potentially incompatible?
>
>Would a plug-in semiconductor rectifier be more
>vulnerable to EMP damage than the original 5U4?
>
>Also, are there active or small-tolerance components
>in any of the other mods that might increase EMP
>vulnerability?
>
>Just wondering ...
>
>--
>Thanks! & 73, doc kd4e  http://bibleseven.com
>Ham Links: http://bibleseven.com/hl.html

Tom in N Texas, KC5INU,  EM12jk, RARA 025, QRPp-I 353, NETXQRP  33,
  QCWA 31587, SKCC 97, Hallicrafters SX-71, S-38, S-38D, National NC-300,
Johnson Viking Ranger, Knight TR106, Heath SB-101, "Sixer", IO-10,
V-7 VTVM, Hallicrafters S-40, Simpson 260E, RCA WV-97A, etc., etc.

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