Related Manuals for Pendulum Audio MDP-1
Summary of Contents for Pendulum Audio MDP-1
- Page 1 MDP-1 Vacuum Tube Mic/DI Preamp Operating Manual Pendulum Audio Pendulum Audio, Inc. PO Box 339, Gillette, NJ 07933 TEL: (908) 665-9333 Web: http://www.pendulumaudio.com email: info@pendulumaudio.com...
- Page 3 The MDP-1 uses two EIA-standard rack spaces, and can be mounted in any standard 19 inch (483mm) equipment rack. If the MDP-1 is mounted in a mobile rack or road case, it is important that the rear of the chassis is supported to prevent possible damage from mechanical shock and vibration.
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Page 4: Power Requirements
MDP-1 and the metal rails of the equipment rack. • Isolate the MDP-1 from units mounted above or below it in the rack. Make sure the front panels are not in electrical contact and that the top or bottom cover screws of the MDP-1 are not touching those of any other units. -
Page 5: Power-Up Sequence
• Turn on the power to the unit using the ac power switch located above the power inlet socket. Although it might seem a bit awkward to put the ac power switch on the rear panel of the MDP-1, there is a very good reason for it. By keeping the ac away from the front panel, hum induced by the ac line into the front panel circuitry can be virtually eliminated. -
Page 6: Phantom Power: +48V
Input Mode: MIC With the input switch in the ‘MIC’ position, the MDP-1 is configured as a mic preamp, with the XLR input connectors enabled and the DI inputs on both the front and rear panels disabled. In this mode the signal path consists of the input transformer followed by a Class A tube gain stage with a transformerless output. - Page 7 (e.g. drums). So, if you’re wondering why the led meters on your recorder are dancing around zero, but the VU meters on the MDP-1 are hovering at or below -10, you’re simply seeing the difference between the peak and average program level.
- Page 8 Gain and Output Controls See ‘Using the MDP-1 as a Mic Preamp’ for a discussion of how to use the GAIN and OUTPUT controls to achieve subtle changes in the character of the sound of the DI. Note that while the MDP-1 can in principle be softly ‘overdriven’...
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Page 9: Replacing The Tubes
Replacement tubes are available directly from us. 1. Unplug the MDP-1 and wait at least 30 minutes for the high voltage in the unit to discharge and for the tubes to cool to room temperature. - Page 10 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: 1500Ω transformer balanced and floating Frequency Response: -1.0dB 6Hz and 65kHz with 10KΩ load, +45dB gain -1.0dB 20Hz and 65kHz with 600Ω...
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Page 11: Limited Warranty
Tube Mic/DI Preamp that the unit is free of manufacturing defects in materials and workmanship for a period of one (1) year from the date of purchase. Pendulum Audio, Inc.'s sole obligation under this warranty shall be to provide, without charge, parts and labor necessary to remedy defects, if any, which appear within one (1) year from the date of purchase.