The Magnepan 0.7, the largest speakers which fin in y modest size 26 foot diameter house are driven by 833A radio station transmitting triodes with 1KV anode voltage through Hammond 1642SE output transformers. The grids of the 833A's are driven by 8:1 step-down transformers which parallel-feed 45 SET drivers. The secondary windings of the transformers connect between the 833A grids and ground. This causes the 833A's to draw about 115 ma and this is more than enough power for the insensitive 0.7 speakers. The bass is supported by a pair of Klipsch 10 subwoofers driven by the preamp.