Re: [Amps] Initial RF testing of 4CX1000A amplifier

["Carl" <km1h@jeremy.mv.com>]

That screen bleed goes back to the 50's or so when tetrodes were more 
popular than triodes.
Carl
KM1H


----- Original Message ----- 
From: "Vic K2VCO" <k2vco.vic@gmail.com>
To: <amps@contesting.com>
Sent: Tuesday, November 05, 2013 11:34 AM
Subject: Re: [Amps] Initial RF testing of 4CX1000A amplifier


> My meter reads -10 - 0 - 40. Actually it is a normal meter with a new 
> scale. There is a 10 mA bleed which brings the pointer to zero when there 
> is no screen current. Very clever idea by GM3SEK.
> I'll be testing with full drive soon.
>
> On 11/5/2013 8:23 AM, Bill Turner wrote:
> > ORIGINAL MESSAGE:          (may be snipped)
> >
> > On Mon, 04 Nov 2013 21:40:48 -0800, K2VCO wrote:
> >
> > >    I  am  not sure the large negative screen current is normal with 
> > > these
> > >    conditions. What do you folks think?
> > REPLY:
> >
> > Negative screen current is normal under conditions of low drive. At full
> > power it should be positive.
> >
> > I highly recommend a zero-center meter for screen current.
> >
> > 73, Bill W6WRT
>
> --
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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