[Heath] More SB-200 joys...

Kenneth G. Gordon kgordon2006 at frontier.com
Fri Jan 13 19:25:46 EST 2012


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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