[Heathkit] Rebuilding Heath HA-10 Warrior power supply

[Carl]

At around 2500V the 572B operating bias is around -3V and the cut-off should 
be at least -100V to keep the import tubes especially calmed down.

With 100W drive a properly updated Clipperton L will do 1200W which is about 
the limit of the transformer.

Carl
KM1H




----- Original Message ----- 
From: "Rick Poole" <wa1rkt at arrl.net>
To: <heathkit at mailman.qth.net>
Sent: Thursday, April 05, 2012 5:52 PM
Subject: [Heathkit] Rebuilding Heath HA-10 Warrior power supply


>
> If I had to rebuild an HA-10 power supply (as if, for example, the
> power transformer was blown), and if I didn't care about keeping it
> original (I don't, especially), I would consider something like the 
> following:
>
> 1.  Replace the 811A's with 572B's
>
> 2.  Install a Peter Dahl / Harbach PT-220 (replacement power
> transformer for the SB-220/221)
>
> 3.  Install a voltage doubler with lots of capacitance and get rid of
> the swinging choke, and end up with something up to 2500 VDC at up to
> 600 ma CCS
>
> 4.  Not sure (yet) what I'd do for a filament or bias supply... would
> need 6.3 VAC at 16 amps and not sure what for bias (up to 100 volts
> at the transformer secondary?).
>
> This should let me drive the amp to 1000 watts PEP output comfortably, on 
> SSB.
>
> Does all this sound reasonable?
>
> Anybody know what the HA-10 power transformer and swinging choke
> weigh?  A hoped-for bonus with this, besides ending up with an amp
> that works better than new, is that it should be somewhat lighter in
> weight.  That is a factor in my plans for mounting.
>
> Thanks...
>
> Rick WA1RKT
>
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