Vox AD10VT, AD30VT, AD50VT, AD15VT Signal Path, Valve Reactor Technology, Power AMP and the Glory

SIGNAL PATH

Your guitar sound passes through the following sections.

(You can refer to “The Guitarist’s Guided Panel Tour” while you read the explanation that follows.)

Power Amp model Speaker

		Effect	Master Vol	Class A
Effect	Pre Amp model
		MODULATION		Class AB
AUTO WAH / COMP	Choose one of 11 types
		DELAY / REVERB

Determined by the

Pre Amp selection

VALVE REACTOR TECHNOLOGY

THE POWER (AMP) AND THE GLORY!

alve Reactor technology was first used on the VOX AD60VT & AD120VT Val- Vvetronix amps.

Since conventional modeling effects for line recording are not used directly with a speaker, they do not include a power amp circuit, output transformer, or speaker. In other words, they only have a preamp circuit.

A real valve amp sound, however, is produced not just by the preamp, but also by the tone and distortion of the power amp, and by the constant changes in impedance that are cre- ated by the power amp driving the speakers. The AD15VT, AD30VT, AD50VT & AD100VT contain an actual low-wattage valve power amp circuit, a virtual output transformer (patent applied for) that uses solid-state components to simulate an output transformer, and a dummy speaker circuit that simulates the varying impedance of a real speaker. This means that although it’s low-power, the power amps used in both the AD15VT, AD30VT, AD50VT & AD100VT have the same circuit structure of an actual all-valve (tube) amp.

While much of the tone creation and shaping carried out is done in the digital domain, the Valve Reactor power amp is 100% analogue. The resulting journey your gui- tar’s signal takes through the analogue world of the power stage plays a major role in pro- viding the all-important feel and tone of the original amps we modelled.

The Valve Reactor power stage is, to all intents and purposes, a bona fide valve (tube) push-pull power amplifier, but in miniature. It utilizes a 12AX7 (ECC83) valve (a dual tri- ode device — meaning “two valves in one”) and is equipped with an output transformer, just like a “real” valve amp.

The power amp output signal is designed to “read” the constantly changing impedance curve of the dummy speaker circuit system and feed this information back to the virtual output transformer — just like an all valve amplifier does. This information permits the behavior of the valve stage to vary with the speaker load (impedance), which is another important part of “real world” valve tone.

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