[NLRS] FS or Trade - 50 Mhz, 222 Mhz, and 432 Mhz FAA 4CX250 Amps

[Terry Van Benschoten]

Hello All,

I purchased these three amps and power supplies from Dennis, NT0V at  
Aurora 2006.  I have run the 222 and 432 amps with success but have  
since replaced them with bigger amps.

So, they are available again to anyone at a bargain price ...... or  
trade.

Wanted $125 each or all three for $300.

Wanted in trade:  (for my contest station)

-  a counter top or over the range Micropwave (new, or like new)

-  a Koreug K Cup Coffee Maker (new or like new)

-  a 144/440 FM Transceiver (new or like new)


Please reply via offline email:    w0vb at arrl.net

See you at Aurora 2009.

Terry,  W0VB   cell: 507-358-2722




 > per Dennis - NT0V in April of 20067
 > I have 2 identical "FAA" amplifiers that I ran until last year with  
a hybrid
 > ring setup on the input and output.  Each amp has a 4CX250B tube.
Drive required is only a few watts.
 > I used this setup for over 10 years.  These amplifiers were  
actually AM
 > transmitters for airports but the exciter portion is disabled or  
removed
 > now.  These two were made by General Atronics and designated FA-78??
 > something.  Some of them were made by Collins with a TV-9 or TV-36
 > designation.  These are rack mount units, each one with it's own  
power
 > supplies built in, something just under two feet tall and about 100  
pounds
 > each.  I have copies of some of the documentation including circuits
 > description and schematics.  These amps have a dual cavity design  
that will
 > also work as is on 222 MHz for 350+ watts and can be slightly  
adjusted to
 > work on 432 at about 300 watts output.  I'm using others of this  
model on
 > 222 and 432 to do just that.
 >
 > Also, I have a 4CX250B amp available for 50 Mhz.  This is a  
commercial low
 > band VHF unit by GE. They rated it 330 watts output.  The amp is a  
small
 > rack mount unit with a blower/power supply unit to fit in the rack  
just
 > below it.  I didn't use the GE power supply.  I had one of the FAA
amplifier
 > units with just the power supply to provide the 2000 volts B+, 325  
volts
 > screen, and the negative bias supply.  It ran 350+ watts for me  
until last
 > year when I upgraded to a 3CX800 amp.  I have the full original  
manual for
 > the GE stuff.  The GE power supply doesn't have a regulated screen  
voltage
 > since it was on FM.  You could add a regulator or a separate screen
supply.
 > The GE amp chassis and GE power supply comprise the package, no T/R  
relays.
 > That all takes up about two feet of rack space.  You could have the  
FAA
 > power supply I used as well, (it is included).
 >
 >
 > Regards,
 >
 > Dennis Clemenson NT0V