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  Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp

Pendulum Audio MDP-1
Pendulum Audio MDP-1
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List Price: $2,900.00
Our Price: $2,700.00

Availability: Usually Ships in 24 Hours
Product Code: 9999-07803


Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp

Pendulum Audio MDP-1 Vacuum Tube Mic Preamp

Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp Details
The Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp is a modern two channel vacuum tube Mic/DI preamp designed to be the ultimate way to get your mic or source directly to tape or hard disk. Unlike vintage or hybrid designs, the MDP-1 uses a pure tube, class A high voltage circuit topology with a transformerless output stage to deliver an open, intimate sound with a level of detail that meets the requirements of the most demanding recording applications. Our short signal path design excels in audio performance, delivering extremely wide bandwidth, low noise, and high headroom.

A key component of the sound of a tube mic preamp is the input transformer. It's here that we let your select how you would like the preamp to sound. The MDP-1 can be ordered with your choice of two low turns-ratio transformers depending on your requirements: a Jensen 13K7A for a full, open sound with plenty of sparkle in the high end and a deep low end - perfect for recording all sources, especially instrumental music; or a custom-wound transformer for a more 'focused' sound, with extra presence and clarity in the midrange - ideal for a vocal sound that easily distinguishes itself in a mix.

The MDP-1 also has all the things you'd expect in a full-featured mic preamp; phantom power, phase reverse, -20dB input pad, a lo cut filter with 10 frequencies and large, illuminated VU meters.

The DI signal path is completely transformerless, with a selection of three input load impedances: 10M for piezoelectric acoustic instrument pickups, 1M for magnetic pickups, and 100k with a 20dB pad for line level sources such as keyboards or other -10dBV equipment.

Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp Features
  • All tube, short signal path design
  • Pure class A, high voltage circuitry
  • Transformerless tube output stage capable of delivering +35dBu
  • Low noise, wide bandwidth and superior transient response
  • Choice of mic input transformer for 'full' or 'focused' sound
  • 30dB gain range in 3dB steps
  • Fully transformerless DI with 100k, 1M and 10M input impedances
  • Ten position mic lo-cut filter (20-180Hz)
  • Gold-plated switch contacts, I/O connectors and tube sockets
  • Polypropylene caps and metal film resistors (pairs matched to 0.1%)
  • Fully regulated high voltage (300V) and filament power supplies with soft-start warm-up and muting
  • Custom toroidal power transformer with shield for minimum hum
Pendulum Audio MDP-1 Vacuum Tube Mic/DI Preamp Specifications
  • Circuit Type: Class A vacuum tube signal path with transformerless output
  • Mic Preamp
    • Input Gain: +33 to +63dB in 3dB steps 
    • Input Impedance: 1500 ohm, transformer balanced and floating
    • Freq. Response: -1.0dB 6Hz and 65kHz with 10Kohm load, +45dB gain
    • Noise: EIN less than -125dBu with 150 ohm input load, unweighted (Jensen 13K7)
    • EIN less than -118dBu with 150 ohm input load, unweighted (Custom)
    • Distortion: THD+N less than 0.03% from 100Hz-10kHz, less than 0.07% at 20Hz, measured with -20dBu input, +10dBu output, +45dB gain
  • DI Preamp
    • Input Gain: +20 to +50dB (Instrument), 0 to +20dB (Line) in 3dB steps 
    • Input Impedance: 10Mohm or 1Mohm (Instrument), 100Kohm with 20dB pad (Line) 
    • Freq. Response: -1.0dB 5Hz and 250kHz with 10K load, +20dB gain
    • Noise: EIN less than -116dBu with input shorted, unweighted
    • Distortion: THD+N less than 0.04% from 20Hz-10kHz
    • measured with +10dBu output, +40dB gain
    • Output Level: +35dBu into 10Kohm load, +25dBu into 600 ohm load, Output control at maximum
  • Meter: selection of output level (0VU = +4dBu) or tube gain (0VU = +20dBu)
  • Phantom Power:+48Vdc applied to pins 2 and 3
  • Mic Pad: -20dB pad at the primary of the mic input transformer
  • Mic Phase: inverts the phase at the secondary of the mic input transformer
  • Mic Lo Cut: 6 dB/octave rolloff from 20-180Hz in 10 steps
  • Polarity: input and output XLR connectors are pin 2 hot
  • Vacuum Tubes: (2) ECC83/12AX7A, (2) 6922
  • Power: 120Vac, 30W (240Vac optional)
  • Power Supplies: +300Vdc and +12.6Vdc, fully regulated with soft-start warm-up
  • Dimensions: 2U enclosure, 19" x 3.5" x 12.5" (48.2 x 8.8 x 31.8 cm)
  • Weight: 14lbs (6.4kg)
  • Notes: 0 dBu = 0.775 Vrms.

All noise measurements are unweighted, 20 - 20,000 Hz bandwidth.

All specifications are subject to change without notice.