This One does not have knobs. There is no electrical cord. It is marked good tubes so I do think the tubes are probably good. There is no power cord and even if there was, I’m not sure if I would plug it in ha ha. Assume it does not work. 17 1/4 inches tall 15 inches wide 8 1/2 inches deep. The chassis is in great condition. The wood could use sanding and refinishing.