[Heathkit] 2 Mod or not 2 Mod <> SB220

[Jim Shorney]

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On Fri, 31 May 2002 04:28:13 -0000, John Luthy wrote:

>I have a SB220 that my father built. I intend to use and would like
>some opinons on the Harbach kits. I think I would like to install the
>new capacator block, the rectifier board, the parasitic suppressor
>kit, the soft key module, and replace the noisey fan.

Take a look at AG6K's amplifier articles at:

http://www.vcnet.com/measures/

He does a lot to justify some of these mods.  FWIW, I checked my L4B
for parasitic resonances with a dip meter as he suggests, and found
two.  A little scary.

>Currently I am using the amp on 110v and have a max output of about
>1kw on 40m and 600w on 10m. It seems to work well but says it is a 2kw
>amp? I do not plan to operate over 1.5kw but would like to have the
>amp at it's full potential.


Are you talking plate input, or RF output?  The 2 KW figure is a plate
input spec which translates to around 1300 watts out ( assuming 65%
efficiency ).  Do yourself a favor, run it from 220v.  People have been
known to set houses on fire running monster amps from 110.  Your wires
will thank you, your breaker panel will thank you, and your amp will
thank you.

- -- 
Jim Shorney      -->.<--Put complaints in this box
jshorney@inebraska.com
nu0c@amsat.org
Ham Radio NU0C
Lincoln, NE, USA
EN10KA
http://incolor.inetnebr.com/jshorney/
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