See, I'm not looking to sell it. It was given to me. Totally free, no charges or anything.
Well, you know what it was worth at THAT point in time, the person you got it from thought it had ZERO value......
I know what it is capable of. Im definitly no guru when it comes to sound equipment (for I am a drummer), its just a neat piece to have especially for my studio. I was just curious to see if I was sitting on a treasure trove or not. What would you guys ask for price wise?
Personally if I wanted to keep it I wouldn't waste my time worrying about what it's worth, if I wanted or needed to unload it I'd put it on eBay and let it fly. As I said AFAIK there really is no market established for that era Sunn mixers, so I'm not sure what you are looking to find out. Unless someone finds a confirmed sale somewhere anything anybody throws out as a price is pretty much just guesswork.
I think it's safe to say that it's no "treasure trove"; sound reinforcement technology in general and mixers in particular have taken quantum leaps forward in the past few years.
Your Sunn isn't vacuum tube technology, and it's not digital. It's big, heavy and awkward with very minimal features.
For example; right now you can get a stereo 16 channel 2 X 600 watt powered mixer with 24-bit FX processor with 100 presets, built in feedback detection, and built in phantom power that only weighs 22 lbs. with a handy carrying handle for a couple hundred used and
under $500 brand new with a 3 year warranty.
IMO your Sunn is great for a fixed location, I'm sure it handles the duties you use it for handily. I think if it were
tube technology someone would be all over it, but as far as some Sunn-o-phile getting all gooey over 80's transistor mixer; well, just don't hold you're breath!
Of course, you never know. Crazier things have happened, which is why eBay is your friend when you are looking for that "gotta have it" buyer.