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Re: [Amps] Grid fuses (was: Life and gain of 3-500Z)

To: "Ian White GM3SEK" <gm3sek@ifwtech.co.uk>, <amps@contesting.com>
Subject: Re: [Amps] Grid fuses (was: Life and gain of 3-500Z)
From: "Tom W8JI" <w8ji@w8ji.com>
Date: Fri, 21 Jul 2006 07:21:30 -0400
List-post: <mailto:amps@contesting.com>
>>An 8877 cathode can emit 50A.  If 50A is flowing into the 
>>grid, how
>>does your electronic circuitry stop it?...

That sounds factual on the surface but the 50 amps actually 
comes from anode current at 10kV anode voltage in pulsed 
applications with a 3CPX1500A7 pulse rated tube with hotter 
cathode and driven with a kilowatt, not 8877 grid current.

Very few amplifiers would be running the cathode at 3CPX1500 
temperatures and even fewer would have 10kV dc between the 
cathode and other elements.

73 Tom 


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