[AMPS] SB-220 TUNE Cap Arcing

[km1h@juno.com]

On Tue, 13 Oct 1998 10:41:31 EST "Norell  Bennett W." <bnorell@lge.co.kr>
writes:
>> 
>> >>As others have eloquently pointed out, it is possible to make the 
>
>SB-220 
>> >>arc just by mistuning it.  
>> >
>> >Neither my SB-220 or my TL-922 will arc by mistuning into a 50 ohm 
>> >termination.
>> 
>> That is kinda goofy that some people say their amps will do that.  I 
>
>
>can 
>> understand ARCing when you've got some strange sorta load and high 
>
>VSWR, 
>> but IMHO tuning into a proper load should not cause arcing in a 
>"well 
>> behaved" amp.  If it does arc into a 50 Ohm load, my guess is 
>something 
>> is a little squirely.
>> 
>> 73,
>> 
>> Jon
>> KE9NA
>> 
>
>Following up:
>I took apart the parasitic suppressors (nichrome wire and 2 100ohm
>resistors in parallel) and the resistors measure ok.
>
>I cleaned the TUNE C and sanded or filed what little black or
>roughness (from the arcing) I saw on a couple of fins.
>
>I haven't had a chance to tune up to see any difference yet.
>If arcing still occurs, and if it is possibly parasitics
>at 110MHz as Rich comments, what can be done?


Well since those are Rich's suppressors that are supposed to work I am
completely dumbfounded and stumped..........................
The same goes for those that believe you cannot mistune an amp into a
dummy load. 

Heck, some fools even believe Clinton!

73  Carl  KM1H


>
>thanks,
>Bennett
>
>
>
>
>
>
>> 
>> 
>
>-------------------------------------------------------------------------
>
>-
>> Jon Ogden
>> 
>> jono@enteract.com
>> www.qsl.net/ke9na
>> 
>> "A life lived in fear is a life half lived."
>> 
>> 
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>
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