[Heathkit] SB-200 Pout

[km1h]

It depends on the tubes, line voltage, drive, carefull adjustment of the 
input network and maybe the goddess Fortuna!.
Ive seen a few that would easily put out 800W on 40M with 100W drive where 
another with the same set of tubes could barely make 650W.

Where did the 150W go?

Some of it was due to mistuned input and the rest soaked up in the filament 
choke. Catastrophic tube failures will sometimes cause saturation of the 
choke. Winding a new choke on a 4"  FT43 rod will get it back to normal. A 
frequent symptom of a real bad choke is the meter lamp getting brighter with 
the amp keyed.

My 6M monoband conversions will all do 700-800W with good used tubes which 
points to a poor efficiency in the original output network as shown by 
decreasing output on the higher bands.

Carl
KM1H




----- Original Message ----- 
From: "john" <johnmb at nc.rr.com>
To: <heathkit at mailman.qth.net>
Sent: Wednesday, November 23, 2005 4:48 PM
Subject: [Heathkit] SB-200 Pout


> Wonder what power levels folks get out of a well running SB-200?
>
> Many thanks
> John K5MO
>
>
>
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