[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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