Google the model numbers of what you want to sell and see what comes up; ebay, or whatever and see what other units of the same type sell for. Keep in mind that a lot of older vintage amps and speakers may need to be refurbished before being used successfully; like capacitors in the amp and the surrounds on the speaker cones. But if the stuff you want to sell currently "works" without evident problem, let someone else pay to refurbish it. That's the way I would approach your situation.
NuBe Advice needed
We just inherited some older higher end equiptment (think McIntosh MC352 era). We would like to keep a setup for ourselves, and sell some to pay the taxes. What is the best way to do that? I am so nervous about how not to get burned, and making sure it gets to where it's going without harn. I know we will have to have someone come to help set it up. Any advice?