Proton 1100 Pre-amp and 1200 Amp

Both seem to be in good shape--I am the only owner. I used them for a few years, then replaced them, and found them in my basement while cleaning up. I have been reading about the amp, but haven't seen much about the pre-amp.

I'm not sure whether to keep them (as spares) or sell them (how much is reasonable?) I've never sold on Audiogon before--is this the right place to sell these products, or should I go to a local dealer (we still have a few around, and at least one sells used equipment, so I would guess that that buy, too).

Thanks for the help. Anything you can tell me is welcome.