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VT12 Features
Input Stage and Hotwire Section
1. INPUT
This is where you plug in your guitar or other instru-
ment. It is a 1/4" TS connector that accepts an unbal-
anced instrument-level input signal from a high-imped-
ance instrument like a guitar or a line-level signal from
a low-impedance source (LINE mode [7]).
2. SIG
This LED indicates when signal is present at the input
jack. It senses the signal after the input GAIN control,
but before the DRIVE and VOLUME controls.
3. CLIP
The CLIP LED lights when the input preamp reaches
its maximum output and is on the verge of clipping. It's
okay for the CLIP LED to blink occasionally, but if it is
blinking frequently or continuously, turn down the GAIN
control [4] or the volume control on your instrument.
4. GAIN
The GAIN controls adjust the input sensitivity of the
instrument input. This allows the signal from the outside
world to be adjusted to optimal internal operating levels.
Set the GAIN control to the NORMAL position (12
o'clock). The SIG LED should stay lit while you are play-
ing your instrument. If the SIG LED doesn't light or blinks
occasionally, turn the GAIN control up. It's okay if the
CLIP LED blinks occasionally, but if it blinks frequently or
lights continuously, turn the GAIN control down.
USA I
USA II
CLASS A
BLUES
JAZZ
HI-FI
ACOUSTIC
LINE
MANUAL
BRIGHT
SIG
INPUT
UK I
UK II
HI GAIN I
HI GAIN II
GAIN
5. MANUAL
Push this button to activate manual mode. When
manual mode is active, the LED next to the button
lights and the display goes blank. All of the channel
presets and effects are bypassed by default when in
manual mode, so only the MODE switch and EQ controls
are active. Use manual mode to simplify the operation of
the VT12 for basic guitar amp operation.
You can reactivate the effects by pressing the EFX
[15] button. The previous effects settings are activated.
You cannot change the effects settings from the VT12
top panel, but you can from the VT12 Control Panel on
your computer.
6. BRIGHT
This button applies a fixed mid/high frequency boost
to the input signal. When Bright is activated, the LED
next to the button lights.
7. MODE Switch
Use the Mode switch to select among 12 different am-
plifier modes, emulating various classic guitar amplifier
sounds. As described in the "Getting Started" section,
the various sounds are created by "hotwiring" the tube
gain stages into different configurations and levels of
gain, along with applying selected EQ voicings.
Note: You can modify and overwrite a factory mode
setting using the VT12 Control Panel's FILE button (see
page 22 for more info).
The VT12 has a 12" speaker as well as a 1.35" com-
pression driver. The compression driver and 12" speaker
combination is used for the microphone input and the
Line, Acoustic, and Hi-Fi settings on the Mode switch
and provides a full-range output. The remaining settings
on the Mode switch only use the 12" speaker.
EQ
TYPE
STYLE
EFX
TYPE
TYPE
Owner's Manual
02
CLEAN
CRU
BUZZ
NO
MIC
C
9
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