On Sat, 27 Feb 1999 14:16:13 +0000 "Ian White, G3SEK"
<G3SEK@ifwtech.demon.co.uk> writes:
>
>
>Someone e-mailed to ask how to stabilize the screen voltage in the
>Collins 30S-1.
>
>The 30S-1 uses a 4CX1000 with a DC-grounded screen, and it derives
>its
>total anode-cathode voltage from a positive anode-screen supply and a
>negative screen-cathode supply, the two supplies being stacked in
>series.
>
>That means the so-called "screen" supply has to provide several
>hundred
>mA of cathode current as well as the few tens of mA for the screen.
>It's
>way beyond the current capabilities of normal screen stabilizers such
>as
>zeners, AG6K's series regulator or my Tetrode Boards, all of which
>are
>only good for a few tens of mA.
>
>It would be possible to stabilize the screen-cathode voltage by
>radical
>re-wiring - essentially by leaving the existing two stacked supplies
>to
>float, and providing the screen voltage separately - but has anyone
>found a simpler idea that will work with the 30S-1?
Has anyone measured the IMD of the stock amp or with the 4CX1500B ? If
decent why bother mucking around?
73 Carl KM1H
>
>73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
> 'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.demon.co.uk/g3sek
>
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>
>
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