I'm afraid I don't quite follow this Rich. (?)
Mark WB8JKR
On Wed, 13 Sep 2000 13:27:42 -0700 measures <2@vc.net> writes:
>
> >
> >>
> >> Most home built amps use large switches that have a high enough
> voltage
> >> rating to prevent any problem - so any switch could be used. The
> question
> >> may be more difficult to answer in the SB-220. It used a
> receiving type
> >> band switch wafer. So, by using a non-progressive shorting
> switch to
> >> replace the original progressive shorting switch, the question
> arose
> >> whether the voltage rating of the switch would be exceeded. I
> did replace
> >> the original switch (which had failed) with a non progressive
> shorting
> >> switch and it has worked fine. The answer may be that I was
> lucky.
> >
> >The SB-220 used a series 300 switch, the same as most other
> >commercial amplifiers with supply voltages less than 3000 volts.
> >The actual rating of that switch is 2.25 amperes@28VDC while
> >switching under power.
> >
> >The current carrying capacity is 12 amperes with the contacts
> >used, and the rated dielectric breakdown is 1500VAC. .....
>
> This is why the 220 (and the 922) needs a stepstart circuit.
>
> - Rich..., 805.386.3734, www.vcnet.com/measures.
> end
>
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