> ad5gb wrote:
>
> 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.
I recall a 144MHz design in VHF Communications which showed excellent IMD
from (I think) a 4CX1000A running at 750-1000W output. It's a couple of days
until I can get near my stuff to look for it - maybe someone else can look
it up in the meantime?
What IMD does the Collins PA using it give?
Steve
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