Phil&Group...That`s a very effective solution for the big tubes when running
5+kv, adding a supressor to the cathode side tamed my pair of 4x1`s running
6700v. I seem to remember posting this some time ago..Some of the older ARRL
Handbooks recommended this method to help tame the larger glass
tubes.And,BTW,I didn`t use nichrome,just good old silver plated copper..Jim,
K7RDX..
----- Original Message -----
From: "Phil Clements" <philc@texascellnet.com>
To: "'Steve Thompson'" <g8gsq@eltac.co.uk>; <amps@contesting.com>
Sent: Tuesday, August 08, 2006 3:46 PM
Subject: Re: [Amps] Tuned Input - IMD and efficiency
>
> > As an aside, adding some capacitance with low inductance leads from
> > cathode to grid won't only help linearity/efficiency, it might improve
> > vhf stability too.
> >
> > Steve
>
> A trick my Elmer showed me many years ago on a 4-1000A was to put a 25pf
cap
> in series with a 10 ohm resistor from each filament pin to chassis ground
> using short leads. This really tames this savage beast, and is really
> effective when running >5 kv on the anode. We are talking grounded grid
> here, with the grid and screen strapped to chassis ground. This really
> settles things down on a 4X1.
>
> (((73)))
> Phil Clements, K5PC
>
>
>
>
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