Earth Revival amp

I have an Earth Revival amp that belonged to my late husband. I need advice on how to find it's value. All I can find is the Serial #, no model number. He loved it and used it every day, it's in great condition. Can someone please point me in the right direction ? Thanks much.

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Earth amp

Do you still have the amp? Can you tell me how many speakers it has. I would be interested in it if you want to sell it. My e-mail is dcoop@cotc.net.

Thanks-Don