SB-200 Problem

[Carlos Avellanet [kf4rrn]]

HI gang,

  After taking a few days off, I finally finished the SB-200 project
today--hopefully for good.  I got tired of the troubleshooting so I just
went ahead and installed the whole rebuild kit from Harbach Electronics,
power supply board, soft start, and step start.  I also installed a glitch
resistor and diodes across the meter terminals and some other suggested mods
and improvements mostly from the Measures web site.  The amp is working
great on all bands [knock on wood].  I want to thanks the list for all the
help and inputs provided and would like to recommend the upgrade to anyone
having problems with it's SB-200.  It is a simple upgrade work wise and it
will give your amp a new lease on life.

Thanks & 73,
Carlos. KF4RRN


> >   Remember my SB-200 project a few months back?  Well, it is back.
> > After I fixed it with your help, of course, I put it away for a
> > little while because I got my hand on another one in better shape.
> > Today I got it out of the closet to replace the face plate.  I
> > decided to give it a try to see how it worked and sure enough, bang!
> >  The 1 ohm 5 watt resistor R-12 blew out as soon as I turned power
> > on.  I have been scratching my head all day trying to figure out
> > what's wrong.  Double checked all connections and all diodes and
> > caps in the circuit.  It all checks good. I installed another
> > resistor and removed the tubes...everything's cool.  I reinstalled a
> > spare set of tubes and the resistor blew out just the same in no
> > time flat. ---snip---

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