Tube Tech MP 1A Mic User Manual
1
Description
TUBE-TECH MP 1A
microphone pre-amplifier
The
TUBE-TECH microphone preamplifier MP 1A
microphone and DI preamplifier.
Each amplifier consists of a microphone input transformer (with a static screen) with a
step-up of +10 dB, a dual tube preamplifier with a stepped gain (5dB/step, passive
and active), an output amplifier with two dual tubes in push-pull and an output
transformer (with a static screen).
The microphone inputs are provided with a switchable -20dB attenuation PAD and
switchable +48 V phantom-power.
The microphone input is capable of accepting levels of up to +6 dBU (1.55V) at 40 Hz
without the
can be used as a unity gain line amplifier.
The high impedanceDIinput is unbalanced and placed in the circuit directly after the
input transformer. The gain range for this input is +10dB to +60dB. When in use, the
microphone input is disabled.
A high pass filter for the microphone and the DI input is switchable between
and
40 Hz
frequency disturbances.
. It is advisable to use this filter in environments with high levels of very low
and +26 dBU (15.5V) at 40 Hz with the
PAD
is a combined two channel
, so the microphone input
PAD
off,20 Hz
Gain errors between the two channels are less than 0.5 dB at any gain setting.
The two amplifier circuits are completely separated and the cross talk between
channels is below -60 dB ranging from 20 Hz to 20 kHz.
040902
Lydkraft ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
2
CONTROLS:
GAIN: The
LF cut: The high pass filter is selectable between
40 H
switch has a range from +20dB to +70dB in steps of 5dB.
gain
off,20 Hz
12dB/octave) and
z (6dB/octave).
Phantom
power: The
phantom power
switch switches the +48V DC power on and off.
The +48V DC is supplied to the microphone input via two 6,81 Kresistors.
PAD: This switch places a -20dB attenuation in front of the microphone
transformer.
040092
Lydkraft ApS
Mose Allé 20, DK 2610 Rødovre
Denmark
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