Con...The amps will see a low impedance load, which tube amps are not good at. For example: if the speaker is 4 ohms you ought to be using 2 ohm outputs which most amps don't have.
I once modified a stereo tube amp so that it inverted one channel, simply by reversing wiring at the output transformer. My purpose was to drive a center channel speaker bridged across the amp, while continuing to drive the left and right speakers in the normal manner. (I made the thing into a three channel amp, without adding any circuitry). The setup worked very well.
I once modified a stereo tube amp so that it inverted one channel, simply by reversing wiring at the output transformer. My purpose was to drive a center channel speaker bridged across the amp, while continuing to drive the left and right speakers in the normal manner. (I made the thing into a three channel amp, without adding any circuitry). The setup worked very well.