Modelling Amp Combo! 1 x 12’’ The VTX150 Valvetronix Pro Neodynium improves and updates the original Vox Valve Reactor power amp circuit by replacing the 12AX7 tube with an EL84, the same tube used in the output stage of all of the legendary 60's Vox combo amps. This EL84 based Valve Reactor is coupled to a 150 watt RMS solid state power amp, offering an unparalled power reserve for an amp in this size and price range. w/Footswitch, manual and Cover