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[Amps] Electronic bias circuit shematic

To: <amps@contesting.com>
Subject: [Amps] Electronic bias circuit shematic
From: "Branko Cehner" <branko.cehner@guest.arnes.si>
Date: Thu, 27 Jun 2013 15:55:23 +0200
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Hi,

 

I have new home made tetrode QRO with GU77b tube using tetrode board from
G3SEK. The resting current on TX at -65V on G1 is about 350mA at 2,3kV which
is about 800W of wasted power, so I  think the usage of  2 or 3 state EBS
will much reduce wasted power. 

 

I was googling the web, but haven't find much of shematics about that. Does
anyone have some nice shematic? I saw the W8JI EBS-1 analyze but I'm not
shure the shematic is complete and is just for analyze purpuse.

 

I have read on some pages, slow EBS circuit can boost the splatters and
lower the quality of SSB singnal, so I look for design which won't do that.

 

The Ameritron sells EBS-1 kit for Ameritron amplifiers (no shematic on web),
but I'm not shure if it works with so low G1 bias as in my hiome made QRO
(the bias of 572 tubes or 3-500Z or even 3cx1500 are quite away from -65V I
use).

 

So sny good information?

 

Best regards, Branko, S52V

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