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[Amps] A question about grid bias in G3SEK's control board

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Subject: [Amps] A question about grid bias in G3SEK's control board
From: "Hsu" <hsu4qro@gmail.com>
Date: Sat, 19 Apr 2014 13:27:32 +0800
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Good morning and evening!
Here is grid bias power supply in G3SEK's control board :http://www.zmdz.com/bbs/incomefiles/20144/1912574624747.JPG I do not understand how it works. I think it is not a regulated power supply. If it work, should be modify as red line marked and replace NTW5142E by TL431(adjustable) or TL431 series a zener(higher volt) Hsu
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