>Amp folks -
>
>I'm also working on a SB221 that belonged to my father (K6VO). He had this
>Amp out on his workbench for several years before he passed away in 1999. I
>have studied it to see what its status is - it has the parasitic suppresser
>mods, the Harbach filter capacitor and meter boards installed. Looks like
>he was all done.
>
>I fired it up, no HV. I found that the multi-meter's negative lead was not
>connected to ground - fixed that, there is HV after all. The Amp seemed to
>tune up, but no power output. The problem turned out to be a missing wire
>to carry the RF from the load capacitor to the antenna relay. It goes from
>above the chasis through a hole to a lead on the relay that also has a
>RFchoke to ground. I can't imagine why this wire would have been removed,
>unless it was for some planned modification. Are there any mods that might
>require removing this wire?
** not likely.
>
>The Amp works well on all bands except 80 where it doesnt want to tune up
>into my dummy load. It works OK at 3.9mhz, but musters only a 100watts or
>so at 3.5. I see there is a 500pf capacitor added in the circuit for 80,
>the bandswitch seems to be working OK, I doubt the capacitor would go bad,
>but who knows.
** the 500pF mica 80m Load padder C sometimes shorts.
> That's what I'll check, any other suggestions?
>
> Dana
>
>
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