Introduction
Rocktron has partnered with LA Custom to produce the ValveSonic series of all tube guitar preamps with
unprecedented sonic versality. Tonal capabilies range from 1950’s American, to 60’s, 70’s, 80’s Brish, to
modern American high gain. The ValveSonics have a unique four tube design with the exibility to reproduce
any musical style including classic rock, metal, pop, country, jazz and more.
The ValveSonic Plexi captures the vintage tones of the iconic Brish “plexi” ampliers, from the stacked amps
and the arena sound of rock to the sound heard during the “Sunset Strip” era of rock, and beyond.
Each ValveSonic model features a front panel input jack. The 1-2 switch aects the input of the tube stage
in the preamp. When switched to “1”, the unit provides the more “modern” type of input used on Brish
style amps. When switched to “2”, the unit provides a faer, “classic” type of input used on vintage Brish
ampliers. The Tight switch is used in conjuncon with the 1-2 switch; in the up posion the input is
“ghtened up” much like more modern Brish ampliers, while in the down posion the ght funcon is not
acve.
The ValveSonic Bright control is a six posion switch that provides ve dierent bright variaons to the
overall tone found in Brish ampliers, from vintage to modern, with 0 being o and 5 being the brightest.
The Gain control is used to determine the amount of GAIN Input level driving the ValveSonic tubes. Boost
can be obtained by ipping the Boost switch to the On posion. The Boost works in conjuncon with the “+”
switch. When the Boost switch is On and the “+” switch is in the down posion you will obtain an extra gain
stage that replicates the 80’s Brish type of tone. When the “+” switch is Up, you obtain an addional gain
stage and essenally add an enre tube to the front end, replicang the 90’s Brish amps.
Bass, Middle and Treble controls determine the amount of these various frequencies present in the signal.
EQ 1 & 2 swch replicates the two dierent style EQs that were used in Brish ampliers over the years. In
the Up posion, (posion 1), the “modern” EQ is replicated, providing a more midrange emphasis. In the
Down posion, (posion 2), “vintage” EQ is replicated.
The ValveSonic series features a unique AFTERBURNER switch. This switch works in conjuncon with
the DRIVE control, providing yet another gain stage aer the EQ secon of the preamp. When the
AFTERBURNER is turned On, this switch emulates a post phase inverter master. When On, you can ulize the
Drive control to adjust the amount of Drive present in the AFTERBURNER stage.
The ValveSonic also features HIGH CUT control to adjust the High Frequency cut in order to roll o some
of the high end “sizzle” when the high gain is used. The Master control determines the output level of the
preamp.
The ValveSonic series has been carefully designed to provide prisne tone, no maer what your style of
performance.