[Amps] Grounded Grid (Screen) 4CX250B power gain

[Gary Schafer]

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Roger
> Sent: Tuesday, July 21, 2009 5:40 PM
> To: Carl
> Cc: amps at contesting.com
> Subject: Re: [Amps] Grounded Grid (Screen) 4CX250B power gain
> 
> 
> 
> Carl wrote:
> > Yes, if you mean cathode driven. It has less grid dissipation than a
> 250.
> >
> >
> Yah can't get much less than zero<:-))
> 
> 73
> 
> Roger (K8RI)

The 4CX250 actually can be run in AB2 as it can stand a couple of watts of
grid dissipation. There are AB2 specs for that tube.
The 4CX1000 is only rated for AB1 operation. Zero grid current, however
Eimac says that a small amount of grid current is acceptable for overdrive
monitoring as in developing ALC from the grid current/voltage change.

73
Gary K4FMX