[Amps] Power from Pair of Eimac 4 x 150 a / 7034?

[Fuqua, Bill L]

  I suspect when EIMAC came out with the 7034 they wanted to suggest that they were a good replacement for the
4X150A. Military particularly wanted to use the same part number when replacing tubes in their radios, and I suspect that
EIMAC wanted to not only promote the 7034 they wanted to make one tube type rather than 2. 
  There are subtle differences between the two tubes, besides plate dissipation limit. The characteristic curves for the 4X150A does not show any 
area where there is a negative flow of screen current, while this is an obvious issue some times with the 7034 and 4CX250B.
This could be a problem in some cases when interchanging these tubes. There are other differences, one is that
when operating the 7034 at 500MHz it does produce the same output power but requires 1/3 the drive power. 
 73
Bill wa4lav

 
________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Colin Lamb [k7fm at teleport.com]
Sent: Sunday, December 28, 2014 8:15 AM
To: Peter Voelpel; amps at contesting.com
Subject: Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034?

"The Eimac data sheet does not confirm that

http://www.r-type.org/pdfs/4x150a.pdf

The RCA 4X150A/7034 data does:

http://pdf1.alldatasheet.com/datasheet-pdf/view/241849/ETC/7034-4X150A.html"



The RCA data sheet refers to a 4X150A only, which is a different tube than the 4X150A/7034.

73,  Colin  K7FM
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