The AD30VT was one of the models in the "AD Chrome"

Valvetronix amp series offered by Vox from 2004 to 2008. The AD Chrome series used the second generation version of the "VR" or Valve Reactor power amp circuit.

The original VR circuit designed for the Valvetronix "blue grill" amplifiers coupled a 12AX7 with a small audio output transformer to make a one watt power tube amplifier circuit. The output from this circuit was used to drive a tonally transparent solid state power amp to boost the RMS output to performance levels. In 2002 literature promoting the original "blue grill" Valvetronix amps, Vox explained that the interaction between the 12AX7 power tube and the tiny audio output transformer combined to allow these models to simulate the tone of an all tube power amp.

The AD30VT cabinet was constructed of particle board covered in traditional Vox basket weave vinyl. It included a 10" speaker of Oriental origin. The speaker was stamped with the model number "AD-30" and a manufacturing date code. The date code stamped on the speaker shown above was "C0803," suggesting an August 2003 production date.

Changing the EL84 Tube in the VTX150
Neither the Vox Showroom or North Coast Music accept responsibility for personal injury or damage to your amp while performing these steps. Proceed at your own risk.

Unplug the amp from the wall. Remove the back panel and xhassis from the cabinet. With the chassis sitting on a table, remove the two screws that fasten the wooden block that holds the EL84 tube in place. After replacing the tubem reverse the process to reassemble the amplifier.