Where can I find suitable replacement tubes for VOX guitar amplifiers and VOX effects units?

For VOX tube devices, suitable and robust replacement tubes are especially important, particularly EL84. This applies especially to the legendary AC30 with EL84 and 12AX7 / ECC83, to the AC15, but also to other models such as AC10, AC30S1, Night Train or Hand-Wired versions. For VOX effects units and modeling concepts with a real tube, devices such as ToneLab EX, ToneLab ST or Valvetronix are also interesting, as they work with a 12AX7 / ECC83 in the Valve Reactor circuit. All these types are also available from BTB as suitable tubes, which is important for older AC30 models, and on request as premium matched tubes.