Yes, Use Audiogon bluebook. THEN, to be safe, subtract 25 %!
It seems to be a buyers market out there. I've rarely gotten the bluebook when selling unless it's a high demand item. If a company is out of business, it can dramatically affect the value in spite of what the blue book says. I own Snell Type A V5's. They won't fetch half of what Audiogon says they're worth. This is as fickle a hobby as any. If you accept this principle, you'll sleep easier. Joe