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Re: [Amps] IM distortion and such

Subject: Re: [Amps] IM distortion and such
From: "Kenneth D. Grimm, K4XL" <>
Date: Wed, 28 Jun 2006 07:23:17 -0400
List-post: <>
Peter Chadwick wrote:
> (a bunch of technical stuff in reply to Tom snipped)
> Slightly off topic, I never understood where the 572B came from for linear 
> service. It seemed to appear in the 1950's: I sort of assume as a bigger 
> modulator tube, being a pair of 811A, but that seems a bit late in the day 
> for a purely audio tube. If designed as an RF tube, it surely would have been 
> given a better structure?
> 73
> Peter G3RZP
> _______________________________________________
As I recall, it was an attempt to fill a gap between the bigger and more 
expensive Eimac offerings and the 811A offered by everyone.  Also, if I 
remember correctly, it was specifically created as an amateur service 
tube as was the 3-1000Z.  Interestingly enough, the 572B is still with 
us, but the 3-1000Z, with its much more elegant structure, is long 
gone.  Sometimes the engineers get it right, but the bean counters get 
it righter.   :-)



Ken K4XL

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