[Heathkit] Heath Warrior as an AM amplifier

Rick Poole wa1rkt at arrl.net
Mon Jan 16 16:27:13 EST 2012


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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