used PW400, its about two years old and in near mint condition, tons of headroom and great sounding amplifier, I have used it with both tube and solid state preamplifiers with great results. output is 400 watts per channel into 4 ohms. Not much else to say other than it sounds great and can control any speaker even difficult loads. This is a 9 on the audiogon scale and is black in color - I have the original box - will package professionally in another outside box. Questions let me know.