>
> 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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>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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