Re: [HamBrewers] shunt screen regulator

 

Dear Pramod!    Thanks for the nice info!    73, dev --- On Fri, 2/24/12, Pramod <vu2ttp@gmail.com> wrote: From: Pramod <vu2ttp@gmail.com> Subject: [HamBrewers] shunt screen regulator [1 Attachment] To: "hambrewers" <hambrewers@yahoogroups.com> Date: Friday, February 24, 2012, 8:59 AM [Attachment(s) from Pramod included below] Hi, With the good old VR tubes becoming hard to get, a lot of hams using the 807/ 1625/6146 tube based homebrew amplifiers tried using the Zener string arrangement for Regulating the Screen Voltage. Sometimes, the -ve screen current produced in the tubes ( many times due to improper loading of the amp) can not only destroy such zener strings, but also any kind of regulator based on the Series Pass Transistor design. Here is a design based on BU508 Shunt regulator based on a QST design article by K5AM, being used by vu2GHB and a couple of others for quite some time now. 73s Pramod Attachment(s) from Pramod 1 of 1 File(s) Screen_Shunt_Regulator.pdf

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