SB-110A - Low xmt audio problem

[Guy G. Giacopuzzi DDS]

I have an SB110A that had just came back from RTO prior to my purchasing
it..When I tested the rig into a Cantenna, I only got 50-60 watts out.
Over the subsequent years, I've asked other owners, and I haven't heard
anyone ever report more output; so this seems to be the typical
amount...I have not heard about the IF stage peaking problem...sounds
reminicent of the two-preselector-peak-problem that plagued
HW-100's,101's, and SB-100's,101's and 102's till they came out with the
little capacitor fix....

ggg
't


re....SB110A...

> This rig has always been plagued with 'low' xmt drive on SSB - about 50w out
> is all I have ever seen. However, when switching to tune or cw mode I always
> get 100+ watts out with no problem. All the tubes are tested very good and the
> mic/cw control responds correctly with a nice smooth adjustment of power out
> in all modes.
>
> The only 'abnormality' I noticed during alignment is the peak xmt output of
> the 1st IF amp occurs about a quarter turn away from peak rcvd signal. If this
> IF stage is tuned for max rcv, the SSB drive drops and 10 watts is all the
> output available. Peaking this stage for max xmt yields 50 watts out but
> reduced IF gain in rcv mode.
>
> I seem to remember someone mentioning there was a design problem with
> the balanced mod in this rig and some components had to be changed for
> a better interstage match.
>
> All suggestions and comments most appreciated - hope to see you on 6m !
>
> tnx es 73,
> Dan Osborne MCNE/MCSE
> WB5AFY
> dosborne at tcs003.chipshot.net
>
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