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Re: [Amps] The dilemma of Tx tube

To: "Rob Atkinson" <ranchorobbo@gmail.com>
Subject: Re: [Amps] The dilemma of Tx tube
From: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 2 Aug 2012 06:32:31 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>

-----Original Message----- 
From: Rob Atkinson 
Sent: Thursday, August 02, 2012 5:06 AM 
To: Jim Thomson 
Cc: amps@contesting.com 
Subject: Re: [Amps] The dilemma of Tx tube 

Eimac issued engineering newsletter FCJ-59D2 superseding 59B5 which
set forth an exception for the 4-1000A as a high mu triode provided Ep
is at least 3 KV.  It listed typical operating conditions.

73

Rob
K5UJ

###  Forget the typ conditions.   Did it list the typ IMD....
for  say 3-4-5 kv..... and at various drive levels. 

##  Did you get a warranty on a new  4-1000..when you ran it
in GG, then  fried the 25 w grid in it.  

##  The engineering newsletter  would pertain to hams wanting to
use the 4-1000 in GG...since there was an abundance of pulls  at the time. 
  The BC DX club had over 200 x  4-1000's  between it's club members.
  No new commercial amp would ever use a  4-1000 in GG. 
They would use a 3-1000Z.   I couldn't afford a new 3-1000Z  at the
time...and a new 4-1000  was even more $$.  4-1000's  were  dirt
cheap back then. 

##  the plate load Z on a 4-1000, with 4400 on it under load is sky high.
I used a 150 pf @ 9 kv  Johnson air variable on my 80-15m amp.  It was 
more than ample for 80m cw.   Too much min C on the Johnson + sky
high plate load Z, meant no 10M  back in 1976. 

##  On a similar note, a few of us managed to get the pulse rated
version of the tube, called a 4PR-1000.    9 kv on 80+40m was a real
hoot.  

Jim  VE7RF

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