In a message dated 6/11/2010 9:20:21 A.M. Eastern Daylight Time,
km1h@jeremy.mv.com writes:
I guess Jim doesnt understand that more RF places more stress on an
already
marginal bandswitch Lou to say nothing about increased gain can result in
instability as proven in many amps.
Some like to go for the most meter wiggle and the heck with reliability(-;
Carl
KM1H
Carl, I would be the first one to agree that the band switch in the SB-220
is marginal for the total power that a pair of 3-500's can produce. I
suppose the thought process by the designers was that since I KWDC input was
the "law" and about 600 watts out being the norm, the band switch was fine.
Moving forward to today's law everyone was kicking the power output up and
the band switches were failing. I would say that about 7 out of 10 of the
amps I gut for 6 have a band switch issue with one or more contacts.
Usually 10 meter contact. Sometimes 10 and 15. Although Denny cut corners
here
and there, he did supply a much better band switch in the Dentron and AS
amps. Drake also had a very good band switch, rarely did I ever see a bad
one. The bigger Ameritron amps have a good band switch also. If you want
to go for that "meter wiggle" you had better build up for it. Just like
the days of drag racing, MO power, bigger and more HD clutch and gears, wider
tires traction, bars etc etc. Lou
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