>
>>
>> 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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