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[AMPS] 4CX1500B / 4CX1000A 50MHz Amp

To: <amps@contesting.com>
Subject: [AMPS] 4CX1500B / 4CX1000A 50MHz Amp
From: 2@vc.net (measures)
Date: Wed, 9 Aug 2000 11:25:14 -0700
>
><Second posting, first one didn't appear on the list>
>
>Hi all, have just finished a 50MHz amp with a 4CX1500B, but the tube I
>have was a 'pull' of dubious origin. Was able to confirm input and
>output circuit resonance and got about 350 - 400 watts out before the
>screen current started to climb and tripped out the "Tetrode Boards"
>(G3SEK) screen protection circuit. Now the screen current remains high
>continuously !! (Tube wrecked ?)
>
>Photos at: http://www.qsl.net/gi0otc/photo2.htm
>
>Question: I have a new 4CX1000A but no data sheet, can I swap these two
>tubes and if so do I need to alter any voltages ?
>
  With any tetrode in linear service, it is necessary to adjust the bias 
V so that there is virtually no grid current.  //  The 4cx1000A grid is 
rated at 0w.  

cheers, Alan

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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