[AMRadio] AM Amps


James M. Walker chejmw at acsu.buffalo.edu
Thu Jan 13 11:48:34 EST 2005


Hum,
4-1000A G.G. amplifier, 3000 VDC plate, 700 MA Plate I, 500 MA
Grid I, with 125 Watts out of DX-100 running apprx 2100 W input and
dissipating 670 watts plate = approximately 1430 watts output!

While the carrier level into 50 ohm dummy load is 1400 watts measured
and a really NICE orange glow! This is with a 200 cfm blower, air system
socket and chimney.

Jim
WB2FCN

----- Original Message -----
From: "Jim candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Wednesday, January 12, 2005 7:07 PM
Subject: RE: [AMRadio] AM Amps


>
> Darrell,
>
> That amp you built with the 4-1000 was a "killer" in more ways than one!
> Time for a confession..
>
> Regards,
> Jim
> WD5JKO
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of Darrell, WA5VGO
> Sent: Tuesday, January 11, 2005 6:04 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] AM Amps
>
>
> At 04:21 PM 1/11/2005 -0500, you wrote:
>
> >In a message dated 1/11/05 12:14:43 PM, ronnie.hull at glowbugs.com writes:
> >
> >
> > > well all I can say is it works.. works well as a matter of fact, and
has
> > > been for 6 years :)
> > > I typically run between 350 and 400 watts of carrier every day. It
looks
> > > great on the scope. Modulation envelope is perfect. 100% modulation.
In
> 6
> > > years Ive only lost one tube, and I accidently broke that one.
> > >
> > >
> >
> >I have to agree with Gary.   You're seeing 1600 watts PEP and 400W of
> carrier
> >OUT with a pair of GG 813s???   Does not compute!   Just curious, are you
> >talking about 400W INPUT power to the linear under carrier only condx
> >maybe?   If
> >so, this would work out to about 133W carrier OUT and each 813
dissipating
> >about 133W which would make more sense.
> >
> >Dennis D. W7QHO
> >Glendale, CA
>
>
> I'm with Dennis and Gary. To run a linear amplifier at 375 watts of
carrier
> and 100% modulation, you will need around 800 watts of plate dissipation.
> For a short time a number of years ago, I tried running an AF-68 and a
> 4-1000A linear amplifier. I could never get more than around 450 watts of
> carrier and stay linear............I didn't need a heater in the shack
> either.
>
> 73,
> Darrell, WA5VGO
>
>
>
> 73,
> Darrell, WA5VGO
>
>
>
>
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