Classic Headroom Micro Amp. Three sensitivity levels plus crossfeed. I have used it with a variety of phones, from lightweight Sony and Sennheiser travel phones to Sennheiser 580, 600 and 650's, and the amp comfortably drives them all. At this moment, I'm listening through Senn PXC 250's and enjoy the solid, extended range the amp gets from these travel phones. Sound is lush and dynamic, not etched like a number of newer amps I've heard.
Operates with batteries for portability but comes with the optional, heavy duty AC power supply for at-home listening. New price was $350 plus power supply (another $50-75, but I don't recall the precise amount). Condition is excellent; can't find any marks or defects on visual inspection. 8/10 for age.
Buyer pays PayPal, shipping and insurance (if requested). I have listed shipping at flat rate $15 but will forward actual costs to Buyer utilizing carrier, insurance and shipping requests of Buyer.