RR about the indexing, I often wondered why there was no mention of that in
the manual. The Heath switch does not have that snap action indexing like
some of the better switches.
In a message dated 6/11/2010 9:04:57 P.M. Eastern Daylight Time,
km1h@jeremy.mv.com writes:
----- Original Message -----
From: Gudguyham@aol.com
To: km1h@jeremy.mv.com ; jim.thom@telus.net ; amps@contesting.com
Sent: Friday, June 11, 2010 7:02 PM
Subject: Re: [Amps] Peter Dahl / Harbach SB-220 transformer
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
Agree Lou, the biggest problem with the 220 is the switch indexing, you
can
see that the blown ones barely have the rotor touching the contact. A
couple
of years ago I bought 200 contacts from Electroswitch and am now running
low; the rebuilt switches go as fast as I can do them.
Dont get me going on drag racing, Im back into it in the vintage classes
for
the past several years.This may be the last season.
Carl
KM1H
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|