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Mods for the 770

  • Microphone PartsMicrophone Parts
    The new mod kit for the MXL 990S and 770 transforms this sub-$100 mic into a high-end studio workhorse: very low noise, high sensitivity, and your choice of color: RK7 (dark), RK-47 (balanced), or RK-12 (smooth presence). Designed by Jim Williams, the mod kit lets you build an expensive-sounding mic without the guesswork and tinkering that plagues most DIY mod efforts. The kit rebuilds the audio circuit with high-grade, hand-picked parts.

CardioidMXL 770

Cardioid Condenser Microphone

The MXL 770 is a small-diaphragm FET condenser with a transformerless output circuit. It is based on the MXL 990, in that it shares a transformerless circuit design (albeit with the addition of a switchable pad and filter), a case design (although taller here), and a capsule.

Two switches on the rear of the microphone selectively and independently enable a capacitative pad (-10dB) and high-pass filter (-6dB/octave @ 150Hz).

MXL 770 and 990SThe circuit, as in the MXL 990 and MCA SP-1, is a version of the transformerless design pioneered by Schoeps. It is a well-understood design, and is very responsive to aftermarket modification and upgrades. (See links in sidebar for mod options.)

770Aside from the finish colors and the height of the microphone, the 770 is identical to the 990S. The latter is part of MXL’s “900 Series,” manufactured exclusively for Guitar Center and its affiliates.

The capsule is MXL’s small-diaphragm model, such as is found in the 603S/604 pencil mics, and the MCA SP-1. As in the SP-1 and 990, the 770 capsule is mounted within a brass baffle ring, which alters the capsule’s frequency and polar response as compared to the 603S and 604.

The capsule’s diaphragm has a 17mm diameter, with a 20mm backplate. These pieces are assembled by stacking them together within a 22mm OD housing.

MXL 770 and 990S PCBsThe circuit is a variation on the Schoeps transformerless design; the same circuit (and PCB) is found in the MXL 770. A simpler version, with no pad and filter, is found in the MXL 990, MCA SP-1, MXL 2006, and MXL V63M.

The MXL 770 ships in a padded plastic suitcase with an elastic shockmount (MXL p/n MXL-70).

The new surface-mount MXL 770 PCBAlthough the 770 had remained in production with through-hole, leaded components long after the MXL 990 was transitioned to surface-mount, by the Spring of 2014 the 770 had also changed to surface-mount construction.

Permalink: MXL 770

Specifications

Frequency Response - CardioidClick Graph to Compare!
770 Cardioid Frequency Response Chart
Pickup Patterns Pads & Filters
Cardioid (15 mV/Pa; 30 - 20,000 Hz)
  • Pad: -10 dB pad (Via Switch)
  • Filter: HPF: -6dB/octave @ 150 (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 17.1mm
Capsule diameter: 19.9mm
Diaphragm gauge: 6 microns
150 Ohms (Low) Max SPL: 137 dB
Self-noise: 20.0 dB(A)
Weight Length Max Diameter Interface(s)
390g (13.76oz) 154mm (6.06'') 60mm (2.36'')
  • 3-pin XLR male (1)
Power Specifications
  • Requires phantom power
  • Phantom voltage: 48v

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