Quoting Ian White GM3SEK <gm3sek@ifwtech.co.uk>:
> The *physical* power dissipation of the 1000A grid cannot be literally
> zero. Eventually Eimac changed the data sheet to allow up to 5mA of grid
> current to flow "for peak signal monitoring purposes"... but for some
> reason the maximum rated power dissipation has always remained at
> literally "zero"
> 73 from Ian GM3SEK
The ALC in the Collins 30S1 is derived from a transformer between the
bias supply and the tube. To get ALC, Grid current must flow .....
even if slightly.
ZERO grid current = Zero ALC.
Possibly a better ALC circuit is one that samples the rf as it comes
into the amp and the user sets the ALC for zero grid current on a per
band basis. Then the 4CX1000 could then operate in a "true" zero grid
current mode.
Don W4DNR
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