Thomas haglund wrote:
>
> hello! i just bought a 145 mhz,Built acording to k2riw. tube amp with dual
> 4cx250b,is there any GOOD internet sites with info and mods for those amps ?
> what is the maximum power output for it and so on ?
>
> //Thomas
>
> SM7TVJ
Unless there is obscure amplifier design by K2RIW for 2m which I don't
know of, the normal K2RIW is for 70 cm, not 2 m.
The 4CX250B is rated for 300 W up to 175 MHz, if memory servers me
correct. 2000 V at 250 mA per tube should give an input power of 500 W
and 300 W output. My own experience of a dual 4CX250B amp on 2m was very
close to this. There is a data sheet for the Eimac 4CX250B on my web
site - see below.
--
Dr. David Kirkby Ph.D,
email: drkirkby@ntlworld.com
former email address: davek@medphys.ucl.ac.uk
web page: http://www.david-kirkby.co.uk
Amateur radio callsign: G8WRB
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