[Amps] Heathkit HA-10 Warrior

[jeremy-ca]

Use 572B's for more dissipation and take advantage of the higher B+. Add a 
small cooling fan.. For CW/SSB go to a capacitor filter and lose the choke 
if Heyboers xfmr can handle it.

Carl
KM1H


----- Original Message ----- 
From: "Allen Jones" <w9dz at yahoo.com>
To: <amps at contesting.com>
Sent: Saturday, February 23, 2008 9:47 PM
Subject: [Amps] Heathkit HA-10 Warrior


>I am in the process of refurbing a Heathkit HA-10
> Warrior amp.  I have looked at some of the old threads
> dealing with this amp and have a couple of questions.
>
> The 866's will go in favor of plug-in solid state
> replacements.  Am I going to end up with a lot of
> extra B plus?  The power supply is choke input to a 8
> Mfd capacitor.  Would a step-start circuit be of any
> value or will the choke be enough to limit the surge?
>
> Are the original parasitic chokes sufficient or should
> I replace them with something different?
>
> This amp has had two plate transformers fail for the
> previous owner.  He used the amp on RTTY. I got a new
> transformer from Heyboer and asked them to build it
> for CCS.  The vast majority of my operation will be
> SSB. I plan to scrap the fixed bias supply and go with
> a zener in the center tap of the filament xfmr in
> series with a high value resistor which will be
> shorted with a relay in transmit.  I will ground the
> grids of the 811's directly to the chassis with heavy
> braid or copper strap.
>
> Any other suggestions?
>
> Thanks
>
> Allen Jones, W9DZ
>
>
> 
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