[Amps] Life on the Screen?

[R.Measures]

>
>On Sat, 29 Nov 2003 08:10:10 -0800 R. Measures <r at somis.org> writes:
>> 
>> 
>> >  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.  
>> >
>
>> >    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.
>> >
>
>> **  If the screen is bypassed, there is no signal potential on the
>screen 
>> - and it can not be used for such.
>
>   Depends upon how well bypassed...
>
**  true

>   I have a 4CX1000A/4CX1500B amp which I'm in the process of...
>updating.   It has an SK-800 socket which has an integral 1500 pf screen
>bypass cap.   
>
>  There is additional screen bypassing mounted right at the socket.  I
>was just wondering if removed those caps and added a small choke as in
>the 30L-1 then, would the plate-screen/screen-bypass capacitance
>"divider" (approx. 100-1 ratio) provide a useful tune&load reference
>signal?

**  it might.  However, tuning up for the specified screen -I will do the 
job.  
>
>  Incidentally, the control grid is swamped with a 50 ohm R so, stability
>is not a concern.

**  provided that there is minimal L in the 50-ohm termination.
>
>73 & Good morning,
>   Marv  WC6W
>
**  tnx for coupler, Marv.
>
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>*