This is the amazing Butler TDB475, which delivers 4X75 watts at 4 ohms, or 2X200 watts at 4 ohms bridged. The amp is bridged to give the Milles 200 watts of pure tube sex power per side. The amp is extremely airy, detailed and laid back. I found that it really opened up the midrange and made it very lively, and still allowed it to remain composure. I know it looks like shit right now, but this was a temporary situation until I got everything the way I wanted it. The system has gone through 5 amplifiers, and 3 component sets, so as a work in progress I never built any serious display amp racks. That is coming.