On 6/11/2010 7:02 PM, Gudguyham@aol.com wrote:
>
> 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
>
Yup, that lightened flywheel or pressure plate could take the throttle
pedal right out from under you foot...if you were lucky. Saw one not
only do that but right on out through the dashboard and a couple hundred
feet in the air along with other associated parts.
I like having the capability for overhead and no worry at normal power.
73
Roger (K8RI)
>
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