Just received it in as a partial trade from another TB'er. Very warm and thumpy. Buttery tone with lots of booty. I can't believe it sounds like it does with only two 12ax7's in it. It sounds a little bit punchier than the 680 IMO, but still maintains the tubey goodness. A great plug and play preamp. Excellent condition with very minimal rack wear. 1-RU. I'm asking $580.00 OBO, with shipping to the 48 (only) and paypal fees included. I'm really not interested in trades at the moment unless you have a Benavente 5-string you want to unload with additional cash from my end. PM or post questions/offers. I will get pix up later. I need to buy batteries for my Digi-cam. Thanks!