Sonocurrent M T2D Parts list manual
modular system guide
revision A
modular system guide
group M: signal modifiers
M T₂D dual triode distortion
Bias
The tube bias controls influence the final wave shape and perceived
character of distortion; settings near the middle are typically the most
versatile, while settings near either end of the range can be interesting
for more extreme distortion, and to influence the texture of any self-
oscillation of the feedback loops when they are near their maximum
levels. An external control voltage can be applied, with the manual control
setting the center or resting point for any applied modulation.
Tilt
The spectral tilt filter controls alternately boost or cut the high and low
frequencies of the input signal, centered at approximately 680Hz. This
filter also greatly influences the self-oscillation of the feedback loops at
their highest levels, and can provide a limited control of the feedback
pitch.
Drive
The drive controls provide manual attenuation of the input signal before
the tube distortion is applied. These will often be left near their maximum
for stronger distortion sounds, as the dry/wet mix controls can then be
used to reduce the final distortion if desired. Lower drive settings can be
very useful for taming the character of high feedback levels.
Feedback
The feedback controls allow the signal after the triode distortion stage
to be returned to the input, just before the tilt filter. Higher settings
will increase the amount of feedback to the point of self-oscillation, at
tube bias control
spectral tilt filter
control
triode input
attenuation
feedback loop
attenuation
tube plate voltage:
12V or 5V
dry/wet mix control
dry/wet mix CV
input attenuation
CV inputs: dry/wet
mix & tube bias
channel inputs &
outputs
M T₂D
dual triode distortion
cv m₁cv m₂
tilt₁
mix₁
tilt₂
mix₂
bias₂
drive₂
feedback₂feedback₁
drive₁
voltage
bias₁
o₂
i₂
b₂ m₂
o₁
o₁
i₁
m₁ b₁
1
1 1
22 2
33 3
4
4 4
5
5
6
6 6
7
7 7
88
8 8
9
9 9
All controls provide comparable, but independent, adjustment of their
respective function for each channel, except for the plate voltage
switch, which is a global setting.
+12V: 111mA • -12V: 65mA • 18HP • 35mm • 202g
The M T₂D dual triode distortion presents two independent channels of
distortion which can be patched separately for dierent sources, stereo
signals, parallel processing of a single source, or in series for the greatest
amount of distortion for a single source.
modular system guide
group M: signal modifiers
M T₂D dual triode distortion
roughly the three o’ clock position of the control. Feedback levels below
self-oscillation can still greatly increase the final distortion, and naturally
leaving the feedback control at minimum will produce no feedback at
all. Careful attention to balancing both the feedback level and the drive
control can produce the most interesting results, especially for medium
distortion levels.
Plate Voltage
The plate voltage switch supplies the tube with 12V or 5V, for either a
smoother character or more severe distortion, respectively. Unlike most
of the controls on the M T₂D, this will eect both channels or stages
simultaneously. The 5V setting can produce quite harsh sounds in
combination with high feedback levels and more extreme bias settings.
The visible brightness of the tube will also be increased at the 5V setting,
which is normal.
Mix
The dry/wet mix control mixes the original signal with the distorted
signal, to adjust the amount of overall distortion at the ouput, and can
be controlled by an external control voltage, with a dedicated attenuator
for each channel. Example 1: lower mix settings can be combined with
a tilt filter setting which emphasizes the higher frequencies, to apply a
stronger distortion to the high end while maintaining clarity by restoring
the unprocessed lower frequencies from the dry signal. Example 2: an
external envelope with a short attack and short decay can be applied to
the dry/wet mix to add a hard leading edge to percussive sounds.
Inputs & Outputs
Each channel or stage of the M T₂D has independent patch points for the
main signal input and output, as well as separate control voltage inputs
for each bias and dry/wet mix control. The second input is connected
internally to the first output, to simplify configuration of the two stages
in series, without an external patch cable. The first output may also be
used in this configuration to extract the signal from only the first stage to
another module, while still passing signal to the second stage, for creative
split-processing from a single source.
