The new Woo Audio 234 Mono amps are simply incredible, in both looks and sound.  But what makes the 234 Monos especially cool is they can accept a wide range of triode output tubes.  Depending on how much output is needed, or your sonic preference, 45 tubes will provide 2W/ch, 2A3 will provide 4W/ch, and the always popular 300B will provide 8W/ch.   But even more interesting is the use of a “plug-in key” that allows the user to essentially wire the amp to output from the plate of the power tube, or the cathode of the power tube.  As well, this plug-in key sets the output impedance.   And if you’re listening to a song that you feel the need to share, flip it to speaker output and enjoy a room full of blissful triode power tube sound!