On Sun, 07 Feb 1999 19:56:37 Scott Townley <nx7u@primenet.com> 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
diss.
>2W instead of 0W; plus 200W reserve plate diss.). Is there a rap on
>these or are they "undiscovered"?
>Just curious...thanks in advance.
>------------
Hi Scott,
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
pins.
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
a 4CX1500B.
3. They aren't much use above 30 MHz due to derating and the inferior
basing.
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. :-)
73,
Marv WC6W
*
___________________________________________________________________
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
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|