Quad 405 amplifier. This amp has been completely updated. The p/s caps have been changed,all signal caps have been changed to high quality Nichicon caps. The opamps have been upgraded to Burr-brown opamps and the speaker binding posts have been replaced. A great sounding amp rated at 100 wpc. I am regretfully selling this amp but I just have too many amps at this time. this amp is a real workhorse, you will not be disappointed. There is a nick on the top left corner of the amp,I bought it this way!