[Heath] More SB-200 joys...

[gjcollins at cox.net]

Hi Ken,

Where can I find the details on Carl's SB-200 parasitic suppressors?  A 
quick search didn't locate anything on-line.

I'm just finishing up a rehab of a SB-200, so your posts have been very 
interesting.

73,

George, KC1V
----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: <Heath at puck.nether.net>
Sent: Friday, January 13, 2012 7:25 PM
Subject: [Heath] More SB-200 joys...


> Today, I replaced the original parasitic chokes with new ones, following a 
> design by Carl
> KM1H.
>
> After all was finished, I now have 100 more watts output than I had with 
> the originals, even
> with well-worn Chinese tubes. 550 watts output on 80 whereas I was just 
> making 450 watts
> output previously. Input plate and grid currents appear to be identical 
> with what they were
> before.
>
> Measuring the original 47 ohm resistors, I find one is now 78 ohms and the 
> other is 210
> ohms.
>
> Other owners of SB-200s might want to do some investigation...
>
> I will report the results of further testing...
>
> Ken W7EKB
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