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I just discovered your web site and was interested to see your findings on the Hughes twt on 24GHz

I also have the 848 tube in a Hughes 1077 psu. Initially i measured it at 19W at 14GHz. After modification of the voltages it gives 11W at 24G but needs around 75-100mw of drive (not a problem as i have a 1.1W solid state pa!)
This result is fine as after i talked to WA7CJO at microwave update in september he only gets an extra 3w out (ie ~14W) of his twt and he has more experience of modification.
I have yet to try input/output matching changes.

 

Thanks Dave for your feedback.