[Amps] PSU design question

[Carl]

Google is still your best friend. One has to be into VHF/UHF to know about 
Steve's products.

Carl
KM1H


----- Original Message ----- 
From: "Ron Youvan" <ka4inm at tampabay.rr.com>
To: "amps" <amps at 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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