Which often is exactly what you want i.e. just gain enough to boost your
tranceivers 100W output to your final reguirement.
I have recently finished building a QB4/1100 (tetrode) GG amp giving a
little over 600W out for 100W in, which was just what I wanted. With a
little more Ua t would probably have had some 10dB gain and thus 1KW out. I
only had some 2900V available (An ex. FL2000B frame and plate transformer,
now proudly spotting an FL2000/QB decal!)
Vy 73 de OZ1PIF, Peter
Sound clips from OX2K operation "off the air":
********** OZ1PIF **************
Shack Ph. +45 4619 3208
DK-4130 Viby Sj.
----- Original Message -----
From: "Terry Gaiser" <email@example.com>
Sent: Tuesday, July 17, 2001 6:24 AM
Subject: Re: [AMPS] 4CX3000A7 GG ?
> I was being very picky .... there is a 4CX3000A but not a A7 version of
> tetrode. I have seen a couple of these type tetrodes in gg service with
> 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" <firstname.lastname@example.org>
> To: <email@example.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
> > up at 2:30 AM one winter morning in 1968 for no reason. Bill met me at
> > and sold me a either a 3CX3000A7 or a 4CX3000A7 for the transmitter at
> > 101.5 on your FM dial Keeping A MIghty Beacon over the Greater San
> > Valley. I was the Chief Engineer and I sure do not remember using a
> > in the amplifier. Is there such a thing as a 4CX2500A7?
> > Billy Dean Ward
> > >From: "Terry Gaiser" <firstname.lastname@example.org>
> > >To: "Ken Barber" <email@example.com>, <firstname.lastname@example.org>
> > >Subject: Re: [AMPS] 4CX3000A7 GG ?
> > >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: email@example.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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