User Manual

SM Pro Audio Page 5 of 12 Tubebox Manual
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3 Introduction
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Tubebox is a single-slot 500-series tube microphone preamp with pristine audio output. It features a
Class A tube preamplifier circuit, switchable phantom power, phase invert, selectable -20dB pad,
and a super fast in-line optical compressor. The front panel includes a TRS microphone input.
The interchangeable 12AX7 preamp tube allows you to experiment with a variety of modern and
vintage tubes to customize the Tubebox’s sound and performance to your taste. The switchable
(in/out) compressor provides adjustable attack and release, and when using the compressor, the
on-board VU meter automatically changes from displaying master level, to amount of gain
reduction, so you can view the exact results of the compression being applied. Last but not least:
The Tubebox audio circuit uses LME49720 ultra-low distortion/low noise Op Amps, for superb audio
output.
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3.1 unboxing
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Your SM Pro Audio Tube Box was carefully packed in the factory and the packaging was designed
to protect the unit from rough handling. Nevertheless, we recommend that you carefully examine the
packaging and its contents for any signs of physical damage, which may have occurred in transit.
If the unit is damaged, please do not return it to us, but notify your dealer and the shipping company
immediately, otherwise claims for damage or replacement may not be granted. Shipping claims must
be made by the consignee.
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3.2 connecting
The SM Pro Audio TubeBox is a 500 series compatible module, which connects to a 500 series
power chassis via the rear card slot. Please ensure the power is off before slotting your module
into your 500 series power supply. Below is the feature layout of the Tubebox multipin connector.
Terminal 1 CHASSIS
2 OUTPUT + (+4 Level)
3 Output + (-2 Level)
4 OUTPUT -
5 GND
6 STEREO LINK
7 INPUT - (-2 Level)
8 INPUT - (+4 Level)
9 INPUT + (-2 Level)
10 INPUT + (+4 Level)
11 GAIN TRIM RESISTOR
12 +16V DC
13 GND
14 -16V DC
15 +48V DC