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[AMPS] Shorted Pi-Networks Turns revisited

To: <amps@contesting.com>
Subject: [AMPS] Shorted Pi-Networks Turns revisited
From: 2@vc.net (measures)
Date: Wed, 13 Sep 2000 16:22:53 -0700
>
>  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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