Phil, Having been through several 51S-1's and S-1A's (still have one),
I'd say the going would be $500-$1200 depending on condition. Is it in
a case or is is a rack mount job? How well does the PTO track and
what's the condition of the crystals (can you calibrate each band and
band edge? Changing an out-of-spec crystal can be a noteworthy
mechanical challenge. As far as operations go, its a fairly decent
receiver. I think that a similar condition R-390A would be a better way
to go, but maybe physical size of of concern? Parts are quite scarce,
should any be needed in the future. But, if the unit you're being
offered is clean, up to spec, and you're a Collins aficionado, there are
far worse things you could do with your money....hi!

Phil Nelson wrote:
Someone is offering to sell me a Collins 51S-1 general coverage receiver, a
"winged emblem" model.

I'd be interested to hear how people would compare it to similar-quality
receivers. I can read the specs in the Osterman book, but what is it really
like to use, and how does it stack up against others? Any quirks, PITA
characteristics, standout features, etc.?

And, assuming it's in average condition, what would be a fair price?

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html