Every once in a while we revisit this topic.
I will just cut and paste the following from some time ago.
Bill Orr's article about super cathode driven tube amps
in the July 67 QST.
He has a example of a 4CX300A (control grid connected to cathode) cathode
driven amplifier.
It only has a power gain of 5. 375 watts out with 75 watts input. But the
nice thing is that the 3rd order products
were 46db down and 5th were -49. This is quite an improvement over most
amplifiers.
I have always wanted to do this using two stages one produce around
300watts output and the second 1500 watts.
A 4CX250b driving 4 parallel 4CX250B tubes. Should get similar results. This
naturally would require 50 to 70 watts drive.
73
Bill wa4lav
At 06:31 PM 8/15/2012 +0200, peter chadwick wrote:
>The 4CX250B is not suitable for use in the classic GG arrangement. Go to
>http://ahars.com.au/documents/eimac01.pdf for an explanation.
>73
>Peter G3RZP
>
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