[AMRadio] AM Amps


Jim Candela jcandela at prodigy.net
Thu Jan 13 18:39:24 EST 2005


To keep the 4-1000 plate from shocking you, ground the
plate, and float the chassis. 

Jim WD5JKO 


--- Gary Schafer <garyschafer at comcast.net> wrote:

> How do you reduce the drive for AM? I take it that
> is how you operate CW?
> 
> 73
> Gary  K4FMX
> 
> 
> James M. Walker wrote:
> > 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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> > 
> >
>
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>
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