[AMRadio] AM Amps


Darrell, WA5VGO hbrnut at earthlink.net
Wed Jan 12 21:31:28 EST 2005


Jim,

If anyone believes that they don't need a good earth ground on their 
equipment, I'd be glad to set them straight.

Darrell, WA5VGO


At 06:07 PM 1/12/2005 -0600, you wrote:

>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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