[Heathkit] Heath Warrior as an AM amplifier

[Carl]

The 375W carrier is obtained with about 30% efficiency. The sideband PEP 
will approach 60% or so.

Since the Warrior is still an 811 amp you are still PS limited with 572B's 
as far as peak power. The Svetlana 572B plate rating is marketing hype as 
its musch smaller than the original Cetron. Figure on 125W in real life. Its 
also been long discontinued.
4X 572B's in other amps are good for around 200-250W carrier and a good air 
flow.

Carl
KM1H




----- Original Message ----- 
From: "Rick Poole" <wa1rkt at arrl.net>
To: <heathkit at mailman.qth.net>
Sent: Monday, January 16, 2012 12:36 PM
Subject: [Heathkit] Heath Warrior as an AM amplifier


> My AM station consists of a DX-100B and an HQ-180A and I'm looking
> for a legal limit amplifier.  "Legal limit", in this case, apparently
> means 375 watts unmodulated carrier output for 1500 watts PEP
> output.  At 60 percent efficiency that would translate to 625 watts
> DC input for unmodulated carrier.
>
> I'm wondering if I can get anywhere near this with a Heath HA-10
> Warrior amplifier converted to 572B's.  The Svetlana 572B is rated at
> 160 watts plate dissipation, and at 625 watts DC input and 60 percent
> efficiency that translates to 250 watts of dissipation or 62.5 watts
> per tube, well within specs.  At 100 percent modulation, if my
> calculations and understanding are correct, PEP input would be 2500
> watts and peak dissipation would be 1000 watts or 250 watts per tube
> (assuming a matched quad).  That exceeds the ratings by a fair amount
> but it's intermittent service at a low duty cycle and I don't know if
> the 160-watt rating is CCS or ICAS (data sheet doesn't say).
>
> So my questions are (1) will the tubes stand up to it, perhaps with a
> bigger fan to move more air?, and (2) will the power supply be able
> to provide enough power?
>
> I also have an HX-10 Marauder for SSB and the Warrior would match up
> nicely (appearance-wise) with both that and the DX-100, hence my
> desire to see if this will work rather than go with something else.
>
> Rick WA1RKT
>
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