KA2YKC@aol.com wrote:
>
>
> I just picked up an SB200 from an estate sale that looks like it sat in a
> basement for 3 years!
>
> Anyway, upon firing it up, it appears to put out 500w into the Bird on a
> dummy load. After about 3 minutes of use, the HV bleeder resistors start to
> smoke from overheating. If I shut the amp off and let it cool, it will do the
> same again after a brief period. HV looks good on the meter, and it RF-wise
> it it ok.
>
> Is it possible that if the caps in the HV p.s. are leaky or bad, the result
> would be a higher - than - normal dissipation through the resistors ?
>
> The caps are the old-looking paper style. Anyone have a recommendatio for
> locating 6 new caps, and their specs for this amp ? Unfortunately, I don't
> have a schematic for the am. Can anyone herlp with a copy of the schematic,
> either on a web site or an emailed JPEG GIF etc..
>
> Thanks in advance for the input....
>
> Eric
> KK2ED
>
>
>
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Eric,
If your so inclined, Harbach Electronics sells a new "drop in upgraded
power supply for the SB-200. I think it's abt 75.00 or 95.00 with a
soft start module. He has a web site and also advertises in the back of
QST. Nice guy to deal with. He has other upgrades, replacements for
sb-200 and 220. Good Luck, Phil W2GE
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FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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