I would like to know the approx. value of my equip

Take some photos and place them on a no reserve auction starting for $1, and in about a week you will have a pretty good idea of their value.

Check completed sales on Ebay.

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It might be worth it to pay the one-time $20 fee for the Audiogon Blue Book service. I subscribed to it for years when I was burning through equipment sales and purchases. It was worth every nickel, tenfold.
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I agree with the Audiogon Blue Book.

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