[AMPS] Shorted Pi-Networks Turns revisited

[measures]

>
>> 
>> 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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