MDP-1 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.