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Purple Audio LLC A Professional Audio Equipment Manufacturing Company. Home of the MC77 Limiter and Biz mic preamp. Gear resources for repair, PDF schematic library - Altec, Ampex, Gates, Pultec, Telefunken, UREI.

PANTS - Differential Mic Preamp
Pants front panel Pants component side  
 

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A four opamp, diferential mic preamp. Designed to work in standard "500" racks.

The Pants uses a unique dual-bobbin input transformer from Cinemag unlike any other. The smooth Gain control helps you dial in the sound you want. If the output level is too high, you can ride the level down with the separate Level control. Pressing the "High" switch changes the feedback network to provide an insane 78dB of clean gain, a great match for very low output mics.

With different Gain, High mode switch, and Level settings the Pants can produce many different tones with the same amount of output level. The front panel DI goes through a FET buffer into the input transformer, adding an extra dimension to the sound of the preamp. The DI load switch gives you two options, making it even easier to get the best direct tone for your instrument. Two LEDs clearly indicate signal level for the gain and output stages at a glance, turning green to indicate signal present, yellow for 10dB below clipping, and red for clipping.

For easy serviceability and tweaking, the Purple discrete opamps can be replaced with any standard discrete opamp or a DIP-8 IC. The Pants uses our custom output transformer which provides two isolated outputs (when supported by the chassis).

Specs:

  • Maximum output level +33dBu
  • Frequency response 10hz – 60kHz +/- 1db
  • Transformer input:
    Mic mode
    Maximum gain 72dB in normal mode
    Maximum gain 78dB in high mode
    Line mode
    Maximum gain 40dB in normal mode
    Maximum gain 42dB in high mode
  • Direct input:
    Mic mode
    Maximum gain 60dB in normal mode
    Maximum gain 64dB in high mode
    Line mode
    Maximum gain 25dB in normal mode
    Maximum gain 30dB in high mode


Simplified Block Diagram:



Pants Pinout

  • Pin 1: Chassis Ground
  • Pin 2: Output A +
  • Pin 3: Output B + (Purple Audio Rack Only - XLR OUT 2)
  • Pin 4: Output A -
  • Pin 5: Audio Ground
  • Pin 6: Output B - (Purple Audio Rack Only - XLR OUT 2)
  • Pin 7: Input -
  • Pin 8: Input -
  • Pin 9: Input +
  • Pin 10: Input +
  • Pin 11: NC
  • Pin 12: +15 or 16VDC 85ma
  • Pin 13: Audio Ground
  • Pin 14: -15 or 16VDC 85ma
  • Pin 15: +48VDC



Retail Price $675 USD. Buy factory direct or through select dealers.


Users say:

  • This thing is the Pants!     -andrew