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Carl
KM1H
----- Original Message -----
From: "Ron Youvan" <ka4inm@tampabay.rr.com>
To: "amps" <amps@contesting.com>
Sent: Saturday, November 07, 2009 7:46 AM
Subject: Re: [Amps] PSU design question
>> I float B- above ground with roughly 125 ohms of R, in one case
>> (separate PSU & RF deck) with 2 separate 250 ohm 25w Rs, one in each
>> chassis, as well as a 1N5408 & .01 3kv cap on each side as well a la
>> Lunar
>> Link.
>
> I have never seen this and I do not understand a reason for this
> practice with one exception,
> that being where a tube element is grounded and that element needs
> monitored and protected, such as
> a klystron where the "body" (cavities) are grounded but must not have more
> than 100 mA of current.
> I am not sure if this design isn't providing grid bias inadvertently in
> some amplifier designs,
> bias that might vary for varying plate current.
> I can't recall what a "la Lunar Link" is, I don't know if I ever heard
> of it.
> --
> Ron KA4INM - Remember, the government cannot give anything to anyone
> that they have not first taken away from someone else.
> (like you and me)
>
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