Marv: I'm not current on these things, but if you could find a schematic for
the old military T-195 , it used a very effective phase discriminator setup
for automatic tuning of the final .!! the tubes were 4X150's which I think
were tetrodes. that xmtr was a very good one in it's day.!!!
I repaired a good many of them in the late 50's and early 60's.
Just another memory.!!!!
carl / kz5ca P.S. the finals were grid driven.!!
----- Original Message -----
From: "Radio WC6W" <wc6w@juno.com>
To: <amps@contesting.com>
Sent: Friday, November 28, 2003 6:52 PM
Subject: [Amps] Life on the Screen?
>
> The Collins 30S-1 (4CX1000A), and several larger commercial amps
> (4CX5000, 4cx10000) for which I have schematics, incorporate a loading
> sensor which has a (capacitive) voltage divider with one end connected
> directly to the plate. These units also all happen to connect the screen
> directly to ground.
>
> The Collins 30L-1 (811A's x4) uses the Plate-Grid capacitance of one of
> the tubes along with smaller than typical grid bypass caps plus a small
> RFC back the the grid return to implement this same type of divider.
>
> Two questions:
> Could the Plate-Screen capacitance of a Tetrode (4CX250, 4CX1000A,
> etc.) be employed in a similar fashion if the screen was bypassed with an
> appropriate value capacitor.
>
> and...
>
> Would the resulting signal be exactly in phase with the Plate voltage
> so it could additionally be used in a phase discriminator style tuning
> indicator?
>
> 73 & Good morning,
> Marv WC6W
>
>
>
>
>
>
>
>
>
> *
>
>
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