I once owned a 212-HD130 combo with EV-12S speakers. It weighed 90 pounds and could break glass at 50 feet, figuratively. The PI is not considered to be a preamp section. It is the power amp driver. Many think it's part of the preamp because of the dual triode used , but it is not. If you look at a schematic that has Preamp Out/Power Amp In capability, the Preamp Out does not come FROM the output of the PI. The Power Amp In goes TO the input of the PI, the first stage of the power amp.