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The output of your Valve Reactor power amp is also designed to “read” the con-
stantly changing “impedance” curve of the loudspeaker system it is hooked up to and
then “report” this reactive information back to the output transformer - just like its “big-
brother” valve amplifiers do. This information permits the behaviour of the valve stage of
the amp to vary with the speaker load (impedance), which is another important part of
“real world” valve tone.
Apart from the vital valve tone this ingenious power amp design provides, it also
allows us to replicate various “circuit characteristics” that are unique to the all-valve
power stages of the amps we’ve modeled. These “characteristics” include: Class A or
Class A/B operation, Presence and Resonance (low end) control circuitry (both found in
the negative feedback circuit that some, but not all, valve power amps have) and power
output. Being able to match such vital characteristics (except power output, which is user
defined) helps ensure that each and every one of our models is as tonally authentic as
possible - as opposed to the usual “close but definitely no cigar” norm of digital modeling.
And just so you know, this paterted in USA power amp technology is unique to VOX Val-
vetronix.
But hey, talk is cheap and ultimately the proof of this particular pudding lies in the
way the amp sounds and feels when you play it. So, let’s cut to the chase and get you
started. What are you waiting for, bud? Grab your guitar and brace yourself for a whole
bunch of toneful fun!