Jeff -- The SB-200's 80m Tune-C padder bandswitch contact is the most
likely to arc. Since the breakdown potential of the bandswitch is c.
5000vdc, and the HF peak-potential is c. 2300v-pk, when such an arc
occurs, it ought to be a pretty good clue that something unusual is
taking place.
On Mar 18, 2005, at 10:45 PM, Jeff Stewart wrote:
> I just put my SB-200 on 220 volts, used it on an 80 meter net one
> night just
> fine. Two nights later, while tuning up it popped the fuses on my
> home 220
> volt sub-box. Pulled the tubes (they seem to look ok) and the amp
> still
> blows the fuses each time I turn it on. No loud bang, pop or any
> noises
> when it died and they only thing inside that looks funky is c12 (.02)
> on the
> tube side of the filament choke. C12 had a black spot on the outside.
> Would it be a good place to start by isolating the filament tap (6
> volt) to
> see if it still blows the fuses? No hi-pot tester here but any advice
> will
> be helpfull.
>
> Thanks,
> Jeff
>
>
> http://www.qsl.net/ka9dad/
> My goal in life is to be as good of a person my dog already thinks I
> am._Unknown
>
>
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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