It's a 2 ohm head. Also suitable for guitar OR bass. Very cool, great sounding and reliable gear from ACC in those days. I have two 370's, a 450 and a 140 myself. You'll find a wealth of information and a forum with knowledgeable folks here - http://unofficialacousticcontrolcorp...board.yuku.com
you'll see the various sections, and if you click the banner at the top, lots of gear information is there. Now, find you a cab, preferable an Acoustic from the era, and have yourself a merry little Christmas!
BTW - I'm serious about the cab. ACC products of the era were truly designed to work well together. I can attest to that fact.