[Amps] 4CX1000A for SSB??

[Gary Schafer]

But what does it tell you?

73
Gary  K4FMX

Mark Marsden wrote:
> Hi Randall
> 
> Have a look at http://granta.digital-crocus.com/Linear_Design_notes/Spectral_regrowth.jpg
> 
> That's a screenshot of the transmit spectrum of my 4CX1000A linear, (Va 2750V, Vs 350V, ZSAC 250mA). It was made by speaking into the microphone normally for a minute and accumulating the trace with the spectrum analyser on peak hold. The lower trace is a barefoot FT1000MP, the upper trace is the output of the linear. 
> 
> 73, Mark, G4AXX
> 
> 
> 
>>>>"ad5gb" <ad5gb at myway.com> 18/03/05 20:33:36 >>>
>>>
> 
> I just found a chart that listed the distortion characteristics of varioius 
> tubes.  I was really disappointed to see how poorly the 4CX1000A ranked amongst
> the competitors.  IIRC, I think it was the absolute worst in the bunch.  
> 
> I got a couple of these things (with sockets) very cheaply a little while ago
> (well maybe longer than that ) and hoped to build something nice for HF out of
> them.  I planned to try a grid-driven AB1 configuration at max anode potential
> with the best screen/bias regulation I could come up with but based on that 
> chart.... it doesn't look like the most wonderful of things to try to do.
> 
> Anyway to make these run more satisfactorially?  Cathode drive /w NFB?  Grounded
> screen (float the cathode below ground) Anyone with any experience and 
> distortion figures better than in that Eimac chart I found?
> 
> Thanks
> 
> 
> --
> Randall D. DuCharme (Radio AD5GB)
> 
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