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

[Terry Van Benschoten]

Begin forwarded message:

> From: Terry Van Benschoten <w0vb at arrl.net>
> Date: May 27, 2009 11:42:31 AM CDT
> To: "qth. net" <nlrs at mailman.qth.net>
> Subject: FS or Trade - 50 Mhz, 222 Mhz, and 432 Mhz FAA 4CX250 Amps
>
>
> 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)
>
> (spelling correction)
> -  a Keurig K Cup Coffee Maker -  (new or like new)
> (spelling correction)

> -  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