True Ian, true, true, true but it worked, if all supplies vary together then
there is no variation between them. Nice. Last time I put a couple 4x250B's
in parallel I grabbed up a 6l6 (poor boy's 807) and a hand full of VR tubes,
that worked too, Where did the good old days go?.
Bob,w5pvr
----- Original Message -----
From: "Ian White, G3SEK" <G3SEK@ifwtech.demon.co.uk>
To: <amps@contesting.com>
Sent: Tuesday, December 14, 1999 4:27 PM
Subject: Re: SV:SV:SV: [AMPS] Tetrode Amp Help
>
> Robert Kirkland wrote:
> > Collins used a separate bridge rectified screen supply, with a
> > resonated choke input filter and a shunt load resistor. Good enough
> > for Collins, good enough for me.
>
> - but only if you accept the whole "Collins package", which is a
> separate (screen-cathode) supply and a separate (screen-anode) supply,
> connected in series to provide the full anode-cathode voltage with a tap
> for the screen. Each must be capable of delivering the full
> anode/cathode current. Also, *none* of the anode, screen grid and
> control grid voltages must be stabilized, so that they can all vary
> together with the mains voltage.
>
> Unless you do *all* of those things, you're not doing it the Collins
> way. (Reference: "Single Sideband" by Pappenfus, Bruene and Schoenike...
> of Collins.)
>
> Finally, that power supply concept is now 35-40 years old, and
> technology has moved on. Art Collins was always an innovator, and you
> can bet he would have moved on too.
>
> 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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