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IntroductionPanel TourSetupPlayingCreating
and Storing
3
Apart from the vital
valve tone this ingenious
power amp design provides, it
also allows us to replicate var-
ious “circuit characteristics”
that are unique to the all-valve
power stages of the amps
we’ve modelled. These “char-
acteristics” include: Class A or
Class AB operation, Presence
and Resonance (low end)
control circuitry (both found in
the negative feedback circuit
that some, but not all, valve
power amps have). Being able
to match such vital characteristics helps ensure that each and every one of our
models is as tonally authentic as possible - as opposed to the usual “close but defi-
nitely no cigar” norm of digital modeling. And just so you know, this patented in
USA power amp technology is unique to VOX Valvetronix.
VOX VALVE REACTOR
FEEDBACK
CIRCUIT
(WITH OR W/O
PRESENCE &
RESONANCE)
REACTOR
AMP
USING
CONSTANT
CURRENT &
REACTIVE
FEEDBACK
MODEL
DEPENDENT
12AX7 (DUAL TRIODE)
PUSH–PULL OUTPUT
PREAMP
VIRTUAL OUTPUT
TRANSFORMER
CLASS A OR AB
MODEL DEPENDENT
PHASE
INVERTER
DUMMY
SPEAKER
12AX7
(ECC83)
12AX7
(ECC83)
BIAS
BIAS