On Sun, 07 Feb 1999 19:56:37 Scott Townley <firstname.lastname@example.org> writes:
>I was just browsing thru my Eimac catalog and noticed the
>4CX600J...designed for AB1 service, low IMD specs, reasonable PS
>requirements, could use the ubiquitous 4X150/4CX250 sockets...
>I'm curious why I've not seen these in use in amateur equipment.
>Seems a pair of them would be preferred to a single 4CX1000A (total grid
>2W instead of 0W; plus 200W reserve plate diss.). Is there a rap on
>these or are they "undiscovered"?
>Just curious...thanks in advance.
I've always thought that they were kinda cute myself... ever since I
inherited a couple of them (actually the 4CX600JA's with the larger
radiator) but, they do have there own peculiarities.
1. The pinout/socket is NOT identical to the 4CX250's; the center
pin & the pin that is always missing from the 250' sockets are for the
heater. The cathode & grid are on two triangular arrangements of three
2. They do run at a much more favorable bias point so, with much less
dissipation they can output almost as much useful low distortion power as
3. They aren't much use above 30 MHz due to derating and the inferior
4. They are extraordinarily pricey (for their size / ratings) if
purchased new. This is likely the reason for no amateur usage. I did
discover that they are used as paperweights (and sold really cheap) in
the central Texas area; pulls from airborne radios
5. ...and finally, when did most hams give a hoot about IMD. :-)
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]
FAQ on WWW: http://www.contesting.com/ampfaq.html
Administrative requests: amps-REQUEST@contesting.com