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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