[Amps] SB-221

Sun Nov 5 16:09:26 EST 2006

Larry, I have a 220. I put in the Dahl 1.3A CCS extra heavy duty trans. The 
amp idles at 3.2K of plate voltage. I can get 1.6 K on my Kenwood SW 2000 
meter with 110w of drive on 75M. I did the mods about 15 years ago, amps 
still cooking today.
I had a book on 220 mods that I also installed at the time, they were pretty 
much the same as the Harbach mods. You want to beef up the HV supply with 
bigger diodes and new caps ( just get the Harbash stuff.) I also got Rich to 
send me his suppressor kit.
The Dahl transformer is a tight fit. It does not just drop in, you have to 
take the side off of the amp and slide it in that way, also drill new bolt 
holes (the side goes back on). The transformer is a little bit too tall for 
the safety cover. Some people just let it bow, I took a nibbler and cut a 
square out for the transformer to stick out (about 1/4".)
With these mods the 220/221 will hang with the other "legal limit" 500Z amps 
(TL922 etc.) James KB4RMN

----- Original Message ----- 
From: "Larry stowell" <lclarks at nc.rr.com>
To: <amps at contesting.com>
Sent: Saturday, October 21, 2006 7:27 AM
Subject: [Amps] SB-221

>
> To all
> Would I expect any increase in performance if I replaced the OEM 
> transformer with the Peter Dahl
> regular replacement?
>
> Larry K1ZW
> Durham, NC
>
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