Product DescriptionThe TUBE-TECH MP 1A is a combined dual MicrophonePreamplifier and Direct Instrument amplifier for microphones or instruments.

The microphone inputs and outputs are balanced as wellas fully floating. The inputs provide a switchable +48 Vphantom power as well as a switchable -20 dB pad. Gainis adjustable in 5 dB increments from +20 dB to +70 dB.

The Direct Instrument Inputs are unbalanced with a gainranging from + 10 dB to + 60 dB. The amplifiers are alltube based and the heaters are on a strict diet of DC-voltage only to avoid hum. All transformers, with the exception of the mains transformer, are enclosed in MU-metal cans. Input andoutput transformers come with a static screen betweenthe primary and secondary wirings.

• Direct Instrument Jack-socket input for various instruments

• DI input impedance > 1 Mohm • Freq. response @ -3 dB: 15 Hz to 60 kHz • CMRR >60 dB @ 10kHz• Typical noise figure: 5 dB @ 200 ohm

The MP 1A is an exceptionally smooth sounding two-channel microphone preamplifier and direct instrument input amplifier emcompassed in one chassis.

two direct paths to valve warmth

DUAL MIC. PREAMPLIFIER

Product Features

• Tube based push-pull output amplifier • Gain from +20 dB to +70 dB in 5 dB increments • Pad in front of input transformer (-20 dB) • Built-in +48 V phantom power • Microphone input impedance = 1,2 kohm• LF Cut switchable between 40 Hz, 20 Hz or Off

MP 1A

s o u n d e n g i n e e r i n g

MP 1A technical specifications

ImpedanceInput, Mic. Preamp: > 1,2 kohmInput, DI: > 1 Mohm/82pFOutput: < 60 ohm

Frequency response @ -3 dB: 5 Hz to 60 kHz

Distortion THD+N @ 40 Hz0 dBu < 0,20 %

+10 dBu < 0,20 %Max. output: +26 dBu < 1 %Max. input: +21 dBu < 1 %

Noise Rg=200 ohmOutput Gain @ +20 dB +60 dB22 Hz-22 kHz: < -85 dBu < -60 dBuCCIR-468-4: < -75 dBu < -50 dBu

CMRR @ 10 kHz: < -60 dB

GainMic. Preamp: 0 dB to 70 dBDI: 10 dB to 60 dB

TubesECC 82 2 pcsECC 83 4 pcs

DimensionsHeight: 2 units 88 mm 3,5" Width: 483 mm 19,0" Depth: 165 mm 6,5"

WeightNet: 4,3 kg 9,5 lbs.Shipping: 6,1 kg 13,4 lbs.

Power requirements@ 115 V/230 V, 50-60 Hz: 30-45 W

NotesAll specifications @ RL=600 ohmLydkraft reserves the right to alter specifications without prior notice

Dealer

Mose Allé 20 • 2610 Rødovre • Denmark • T +45 3871 0021 • F +45 3879 0091 • www.tube-tech.comLYDKRAFT

Lydkraft ApSMose Allé 20, DK 2610 Rødovre

Denmark

1

TUBE-TECH MP 1Amicrophone pre-amplifier

Description

The TUBE-TECH microphone preamplifier MP 1A is a combined two channelmicrophone and DI preamplifier.

Each amplifier consists of a microphone input transformer (with a static screen) with astep-up of +10 dB, a dual tube preamplifier with a stepped gain (5dB/step, passiveand active), an output amplifier with two dual tubes in push-pull and an outputtransformer (with a static screen).

The microphone inputs are provided with a switchable -20dB attenuation PAD andswitchable +48 V phantom-power.

The microphone input is capable of accepting levels of up to +6 dBU (1.55V) at 40 Hzwithout the PAD and +26 dBU (15.5V) at 40 Hz with the PAD, so the microphone inputcan be used as a unity gain line amplifier.

The high impedance DI input is unbalanced and placed in the circuit directly after theinput transformer. The gain range for this input is +10dB to +60dB. When in use, themicrophone input is disabled.

A high pass filter for the microphone and the DI input is switchable between off, 20 Hzand 40 Hz. It is advisable to use this filter in environments with high levels of very lowfrequency disturbances.

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 betweenchannels is below -60 dB ranging from 20 Hz to 20 kHz.

040902

Lydkraft ApSMose Allé 20, DK 2610 Rødovre

Denmark

2

CONTROLS:

GAIN: The gain switch has a range from +20dB to +70dB in steps of 5dB.

LF cut: The high pass filter is selectable between off, 20 Hz 12dB/octave) and40 Hz (6dB/octave).

Phantompower: 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 microphonetransformer.

040092

SPECIFICATIONS for TUBE- TECH MP 1A

Impedance TubesInput, Mic. Preamp: > 1,2 kOhm ECC 82 3 pcInput, DI: > 1 Mohm/82pF ECC 83 1 pcOutput <60 Ohm

DimensionsFrequency response @ -3dB 5 Hz to 80 Hz Height: 2 units 88 mm 3,5”

Width: 483 mm 19,0”Distortion THD+N @ 40Hz Depth: 205 mm 8,1”

0 dBU 0,20 %+10 dBU 0,20 % Weight

Max. output: +26 dBU <1 % Net: 5,5 kg 12,1 lbsMax. input: +21 dBU <1 % Shipping: 6,9 kg 15,2 lbs

Noise Rg=200 Ohm Power requirementsOutput Gain @ +20 dB +60 dB @ 115 V/230 V, 50-60 Hz 30-45 W22 Hz-22 kHz < -85 dBU < -60 dBUCCIR-468-4 < -75 dBU < -50 dBU

CMMR @ 10 kHz < - 60 dBNotes

Gain (0 to 10dB, 1dB step) All specifications @ RL = 600 OhmMic. Preamp 0 to 70 dB Lydkraft reserves the right to alterDI 10 to 60 dB specifications without prior notice