Dual Mono Microphone Preamplifier/ DI

The TUBE-TECH MP 1A is a combined dual Microphone Preamplifier and Direct Instrument amplifier for microphones or instruments.
The microphone inputs and outputs are balanced as well as fully floating. The inputs provide a switchable +48 V phantom power as well as a switchable -20 dB pad. Gain is adjustable in 5 dB increments from +20 dB to +70 dB.

The Direct Instrument Inputs are unbalanced with a gain ranging from + 10 dB to + 60 dB. The amplifiers are all tube 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 and output transformers come with a static screen between the primary and secondary wirings.

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
• CMRR >60 dB @ 10kHz
• Direct Instrument Jack-socket input for various instruments
• DI input impedance > 1 Mohm
• Frequency Response @ -3 dB: 15 Hz to 60 kHz
• Typical noise figure: 5 dB @ 200 ohm

Online Manual
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Specifications

• Impedance
  Input, Mic. Preamp: >1.2 kohm
  Input, DI: 1 Mohm/82pF
  Output: < 60 ohm
• Frequency response @ -3 dB: 5 Hz to 60 kHz
• Distortion THD+N @ 40 Hz
  0 dBu: < 0.20 %
  +10 dBu: < 0.20 %
• Noise Rg=200 ohm
  Output Gain @                  20 dB                 60 dB
  22 Hz-22 kHz:               < -85 dBu          < -60 dBu
  CCIR-468-4:                 < -75 dBu          < -50 dBu
• CMRR @ 10 kHz: < -60 dB
• Max. output @ 1 % THD+N: > +26 dBu
• Gain
  Mic. Preamp: 0 dB to 70 dB
  DI: 10 dB to 60 dB
• Tubes
  ECC 82 2 pcs
  ECC 83 4 pcs
• Dimensions
  Height:2 units 88 mm 3.5"
  Width: 483 mm 19.0"
  Depth: 165 mm 6.5"
• Weight
  Net: 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