[AMRadio] AM Amps


Gary Schafer garyschafer at comcast.net
Thu Jan 13 16:49:46 EST 2005


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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