OMNITEC-67A
VINTAGE PREAMP
GENERAL OVERVIEW
3
FEATURE OVERVIEW
3 TUBE TYPES
The OmniTec-67A features three tube types, provi-
ding you with a variety of options to add warmth and
saturation to a track. Each tube type offers a different
frequency response, output gain, and harmonic ran-
ge.
LINE/MIC SWITCH FOR BASIC GAIN STAGING
The plug-in includes a line/mic switch, which allows
you to select a source - each with its own frequency
response and behavior (Mic impedance vs. Line
impedance). The plug-in auto-compensates at the
output stage.
CLASSIC 3-BAND EQUALIZER
As an extension to the original unit, we have added a
vintage 3-band EQ. Its frequencies have been meticu-
lously selected to provide you with even more op-
tions than its hardware counterpart did.
2 BIAS VOLTAGE OPTIONS
The bias control heavily influences how the tubes are
driven, having an effect on their temperature and re-
sistance. If they are too cold (over-biased), the valve
sounds thin, and if they are too hot (under-biased)
the valve oversaturates. Choose between 2 options
to find the optimal tone for your production.
As you can see in the diagram above, the Om-
niTec-67A has 2 inputs. The mic input introduces the
incoming signal into a microphone transformer, and
into a premix amplifier (first ½ of an 12AX7) there-
after. This adds an additional saturation stage that
you can control using the level of the incoming signal.
The line Input is connected straight into the input
switch. Since there is no level difference between the
mic and line input in the digital world, we compensate
for the line input signal to reach the same boosted
level as the mic input (not shown in the diagram).
After the input switch, there is an input potentiometer
that acts as an attenuator before the single-stage
booster (second ½ 12AX7).
This potentiometer can act like a level and saturation
control before the EQ in the OmniTec-67A.
The single-stage booster injects the signal into a 3-
Band equalizer and an output control that acts as an
attenuator. With the EQ and the output control, it’s
possible to saturate the last stage of the circuit (third
1/2 12AX7 and 6CG7 network) in very interesting
ways.
Finally, we introduce an output transformer for that
extra oomph. It’s worth mentioning that the phase
control is not shown in the diagram, but it changes the
phase at the input level before any of the stages.