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John Hardy M-1 Microphone Preamplifier, 1 Channel  From John Hardy

1 Channel Mic-Pre

John Hardy Company


"Experience the Difference"

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Manufacturer's Description from John Hardy

The M-1 Mic Preamp is among the finest mic preamps in the world. It provides the accuracy and transparency that is missing in other mic preamps. No matter what your application, the M-1 will provide superior sound quality. The world's best input transformer (Jensen JT-16-B), best op-amp (990 discrete op-amp) and the elimination of all capacitors from the signal path combine to provide the highest performance.

The M-1 has a 19" wide mainframe rack-mount chassis (1.75"H x 19"W x 8"D) and can be ordered with 1 to 4 channels. There are two meter options and the best Jensen output transformer (JT-11-BMQ) is also available as an option. Additional channels and options can be easily added later up to the total capacity of the mainframe.

The M-1 was introduced in 1987 and while sonically identical to the M-2 there are a few control differences. The M-1 has a two-section gain-pot providing continuously variable adjustment in two overlapping ranges that are selected by the "HIGH GAIN" switch. (The M-2 has a 16 position gain-switch with 1% metal-film resistors providing accurate and repeatable gain settings. Since the "HIGH GAIN" switch isn't necessary, the M-2 is available with either a "20 OHM MIC" switch OR a "20dB PAD" switch).


* JT-16-B Input Transformer. Jensen's best mic input model.

* 990 Discrete Op-Amp. Faster, quieter, more powerful and better sounding than typical monolithic op-amps.

* Elimination Of All Coupling Capacitors From The Signal Path. Results in less degradation of the audio signal.

Standard Features:

* Dual Range Gain Control And 'High Gain' Switch. Provides great feel and resolution for easy and accurate adjustments.

* Polarity Reverse Switch.

* Phantom Power Switch.

* All Front Panel Switches Are LED Illuminated.

* Gold Plated XLR Connectors for maximum reliability.

* Ground Lift Switch On Each Channel. Helpful for eliminating ground loops.

* Toroidal Power Transformer With Additional Shielding. Eliminates hum problems so no external power supply is needed.

* Universal Power Supply. Internal switch provides six primary voltage choices to accommodate use anywhere in the world.

* Chassis Ground Isolation Switch. Helpful for eliminating ground loops.

* Built To Order, the way YOU want It. Various options can be easily field installed at a later date.


* VU-1 meter. Very accurate and informative 20 segment LED meter card with separate peak LED for monitoring preamp output.

* PK-1 Peak LED metering only (not required if VU-1 is installed).

* JT-11-BMQ Output Transformer. Jensen's best line output transformer.

* Pin 2 Or Pin 3 High. Can be ordered either way and internal jumpers make changes in the field easy.

John Hardy Company

About Manufacturer

The John Hardy Company manufactures and distributes world class microphone preamplifiers and other signal processing products for recording professionals and project studio engineers. The audio circuitry, components and construction used on all John Hardy products are simple, elegant and superior. The most popular product, the M-1 mic preamp, has been impressing artists, engineers and listeners around the world since 1987. Typical comments include "Whoa!", "Even the producer could tell the difference!" and "I won't record without them!"


E.I.N., 20Hz - 20kHz Unweighted 150 Ohm source -129 dBu
  0 Ohm source -132 dBu
Maximum Input Level >30Hz +12 dBu
Maximum Output Level At 990 Output 75 Ohm load +24 dBu
CMRR 100Hz 100 dB
  10kHz 80 dB
Deviation From Linear Phase 20Hz - 120kHz <2 deg
THD, JT-16-B, (Below Saturation) 20Hz 0.036 %
  30Hz 0.022 %
  50Hz 0.010 %
  1kHz 0.003 %
THD, JT-16-B & 990:      
60db Gain, 10k Ohm Load, +24dBu Output 10kHz 0.005 %
  1kHz 0.004 %
40db Gain, 600 Ohm Load, +24dBu Output 10kHz 0.003 %
  1kHz 0.003 %
40db Gain, 75 Ohm Load, +24dBu Output 10kHz 0.030 %
  1kHz 0.005 %
DC Offset   <100 uV

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