SB-200

[Carlos Avellanet]

Hi gang,

Here's an update on my SB-200 for all interested.  I replaced all 6 power
supply caps and bleeder resistors. The amp turned on fine and was providing
about 600w output on CW and about 450w SSB.  Shortly after capacitor C-14 to
pin 3 of V2 blew out with a fancy flash and a trailing plum of smoke.  The
amp still works but power is down to about 300w CW and around 150w SSB.  It
seems it is working on only one tube, though both tubes light up. I double
and triple checked my newly installed parts and inspected the board for
other damage--none found.  I replaced the cap and the power output is still
down.  I wanted to check the tubes but discovered my B&K 707 tester does not
support testing 572B's.  Troubleshooting is on hold until I can verify tubes
condition.

Question, some of this caps capacities are identified as uuF.  I may be
showing my ignorance but I am familiar with uF and pF, what's uuF???  Nano??

Carlos. KF4RRN



> Hi gang, thanks for all the inputs on my SB-200 problem specially to Ray,
> Mark, David, and Ed.   I was off work today and had time to play.  Three
of
> the 6 power supply capacitors were dead shorts.  I checked all of the
diodes
> and they are all good.  The six bleeder resistors however, range from 17
to
> 23K.  No a single one close to the 30K rating.  I am going to do a search
on
> the net next to try to find some replacements.  The caps I already ordered
> from Bill.
>
> I'll keep you all posted in hopes that my experience will benefit others
in
> the same boat.
>
> Thanks,
> Carlos KF4RRN
>
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