Billy,
I was being very picky .... there is a 4CX3000A but not a A7 version of that
tetrode. I have seen a couple of these type tetrodes in gg service with both
grids grounded but the you get only about 1/2 to 2/3's the gain in this
configuration versus grid driven AB1 service.
Good Luck,
Terry W6RU
----- Original Message -----
From: "Billy Ward" <billydeanward@hotmail.com>
To: <w6ru@bak.rr.com>
Sent: Monday, July 16, 2001 9:13 PM
Subject: Re: [AMPS] 4CX3000A7 GG ?
> Well,Unless I am badly mistaken--and I think that I am not--I woke Bill
Orr
> up at 2:30 AM one winter morning in 1968 for no reason. Bill met me at
Eimac
> and sold me a either a 3CX3000A7 or a 4CX3000A7 for the transmitter at
KAMB
> 101.5 on your FM dial Keeping A MIghty Beacon over the Greater San Joaquin
> Valley. I was the Chief Engineer and I sure do not remember using a
triode
> in the amplifier. Is there such a thing as a 4CX2500A7?
>
> Billy Dean Ward
>
>
> >From: "Terry Gaiser" <w6ru@bak.rr.com>
> >To: "Ken Barber" <kenw2dtc@home.com>, <amps@contesting.com>
> >Subject: Re: [AMPS] 4CX3000A7 GG ?
To: <amps@contesting.com>
> >Date: Mon, 16 Jul 2001 20:52:55 -0700
> >
> >There is no such tube as a 4CX3000A7.
> >Terry W6RU
> >
> > ----- Original Message -----
> > From: Ken Barber
> > To: amps@contesting.com
> > Sent: Monday, July 16, 2001 8:39 PM
> > Subject: [AMPS] 4CX3000A7 GG ?
> >
> >
> > I read a description of a tetrode linear amp that had both grids
> >grounded to the chassis and the drive applied to the cathode through a
> >filament choke. Could this grounded grid application be applied to a
> >4CX3000A7? Would it work similar to a grounded grid 3CX300A7, ie. high
> >drive power requirement etc.
> > 73,
> > Ken W2DTC
> >
> >
>
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>
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