[NLRS] 144 and 50 MHz amps for sale

[Dennis Clemenson]

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
combinbed 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

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