[MRCA] T-368

[Steve Hobensack]

The Johnson Viking 500 has an 807 clamper and string of voltage regulator tubes that are engaged in the sideband mode. Three watts from an external SSB exciter are needed for drive. The VR tubes are also engaged in the "External Exciter" mode in the T-368. I hooked up my Central Electronics 10B Sideband Exciter to the T-3 (with a little swamping) and had a SSB qso with good audio reports. The clamp tube in the Viking 500 Changes the 4-400 to class AB1 in SSB amplifier mode. Perhaps the T-3 clamp tube does the same thing? The T-3 book is unclear about this.
...Steve...N8YE


(snip)
> > anyone have any   idea what's behind the idea of
> using a clamper on  
> > the PA screen   instead of just biasing the PA tube
> into cut off?  
> > Was it to run the   PA tube in a more linear state or
> an attempt to  
> > keep the PA voltage
> >   from floating too high? Or is it just a good way of
> developing    
> > heat when the transmitter is in standby?
> > Ray Fantini KA3EKH
> >
> >
> >
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