[Hallicrafters] SR-400 RF Output ???

[David C. Hallam]

I don't know what the rated input or output for the SR-400 is, but from what you have given in the email, what you are getting out sounds about right for the input quoted.  800V @ 350mA is 280W input.  With that you should be getting about 160W +/- out.  What are your voltages under load?  Do you have a scope?  You might want to measure the peak drive voltage you have at the grid of the finals.  Have you checked the alignment of the driver and PA grid circuits?

David
KC2JD

> I'm hoping someone familiar with the proper operation of a SR-400 Cyclone 
> transceiver (paired up with a PS-500A-AC supply) can give me an idea of 
> how much full rf output (not input) in watts in the CW position is 
> "normal" into a 50 ohm dummy load. I've been fiddling with one that has a 
> new pair of, idle plate current matched and neutralized, 6JH5 finals and a 
> good driver tube.
>
> Best I can get on 80/40/20 meters is 150 watts CW output @ 350ma plate 
> current. Output too low? About right? PS-500A-AC has been completely 
> rebuilt and all voltages (800vdc, 280vdc, -125vdc) & idle plate current 
> (70 ma) are correct. All caps and resistors in the PA circuit are OK. I'd 
> really appreciate some expert opinions/advice before I go any further.

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