[NLRS] 144 and 50 MHz amps for sale

[DClemenson at otpco.com]

Hi All,

I'm going to be down in MSP for Aurora and wonder if anyone going is interested
in my old 144 amplifier setup. It was in service through last year and was
working fine when I upgraded to a Commander VHF amp. 

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 with a smaller
driver tube.  I don't recall that tube number, I'm in a motel in Jamestown
tonight.  Each amp will put out 350 watts, or more, and the combined setup runs
700 watts output.  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.

If someone wants the whole 144 setup, you provide your own T/R relays, I'd sell
it for $350 with the input and output hybrid rings.  Sold separately, $200 each.

I will be home Wednesday night and can send .jpg pictures to anyone interested.
 Thursday I'm on the road again and won't be back home before Saturday so I'd
need to know by Thursday morning if someone is interested in having them brought
to Aurora.

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.  I'd like $150 for the GE amp
chassis and GE power supply, 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, but I'm not
going to haul all this stuff to Aurora without some pretty strong interest. 
Again, I can take some pictures Wednesday when I get home.

This stuff is available for pickup near Devils Lake, ND, or can be hauled to
Aurora by arrangement.  Actually, it can be hauled to CSVHF in July as well.

Any takers?

Regards,

Dennis Clemenson NT0V