I thought they were talking about bandswitches.
Mark WB8JKR
On Wed, 13 Sep 2000 16:22:53 -0700 measures <2@vc.net> writes:
> >
> > I'm afraid I don't quite follow this Rich. (?)
> >Mark WB8JKR
> >
> The TL-922 and the SB-220 draw so much current at turn on they dim
> lights. A stepstart reduces inrush current and prolongs the life of
> the
> on/off switch.
> >
> >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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