[Heathkit] Heath Warrior as an AM amplifier

[Carl]

http://www.arrl.org/files/file/Technology/tis/info/pdf/5602039.pdf
The 950 is an excellent AM rig, especially the SD and SDX versions.


The current 572B's from China suffer the same lower plate dissipation no 
matter what sellers try and tell you, the spec sheet is on the factory web 
site at 125W.
With that in mind, the inherent 30-35% carrier efficiency and the doubling 
of the RF peak voltage under modulation Id limit them to 2000V full load.. 
Youre now up to the same Pd as a 3-500Z which is good for about a 200W 
carrier on AM.

Carl


----- Original Message ----- 
From: "Rick Poole" <wa1rkt at arrl.net>
To: <heathkit at mailman.qth.net>
Sent: Monday, January 16, 2012 4:27 PM
Subject: Re: [Heathkit] Heath Warrior as an AM amplifier


>
> At 01:16 PM 1/16/2012, Carl wrote:
>
> >>>>>
>>The 375W carrier is obtained with about 30% efficiency.
> <<<<<
>
> Good afternoon, Carl.
>
> I don't understand that.  I just tried a test on my TS-950 and TL-922
> and when driving the linear to 400 watts output measured on two
> different wattmeters (they match within less than 20 watts), HV
> measured 2950 VDC and IP measured 240 ma, for a power input of 708
> watts.  That calculates out to about 56.5% efficiency with a dead
> unmodulated carrier.
>
> >>>>>
>>Since the Warrior is still an 811 amp you are still PS limited with
>>572B's as far as peak power.
> <<<<<
>
> That's what I was afraid of and it's certainly true of things like
> the AL-811H and the 30L-1.  I was hoping that the Warrior, being less
> size-limited, might have had better margins designed into the power 
> supply.
>
> I wouldn't mind doing a serious rebuild of the power supply if that's
> what it takes... solid state rectifiers, big caps, get rid of the
> choke, maybe even a different power transformer, see if I can boost
> HV up to 2500 or so... course, then logical question is, why not just
> buy what I want?... answer is I like the way the Warrior matches up
> with the Marauder in styling, I have no need or desire to keep it
> "correct", so I don't mind rebuilding it if I can buy it cheaply
> enough, in fact one option would be if I can find one with a blown
> choke or power transformer.
>
> Rick WA1RKT
>
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