In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The AD50VT features Vox's patented VOX Valve Reactor found on all Valvetronix products. The Valve Reactor circuit uses a 12AX7 triode vacuum tube together with an actual low-wattage tube power amp circuit, a virtual output transformer and a dummy speaker circuit that simulates the impedance changes of a real speaker. It also reconfigures itself so that its characteristics are the same as the amps it's modeling. Starting with the classic AC30 and ranging from vintage to modern, hi-gain to clean, 11 coveted amps are simulated. Features a single 12" Vox speaker and 50 total watts of power.