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M-2b Two Channel
Transformerless Vacuum
Tube Microphone
Preamplifiers more info

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Vacuum Tube Listening Test

 
Product Specifications
   


Minimum Gain 14 dB
Maximum Gain  

(3 ranges with continuous trim)

50 dB
Frequency Response  

+0 / -3 dB

4 Hz to 130 kHz
Noise  

50 dB Gain, 10 Hz - 30 kHz, 150 ohm Source

-116 dB EIN
Total Harmonic Distortion + Noise  

30 dB Gain, 10 Hz - 20 kHz Bandwidth, 0 dBu Out

< .02%
Intermodulation Distortion  

(50 Hz & 7 kHz) 35 dB Gain, +27 dBu Out

< .0009%
Phase Response  

35 dB Gain, 20 Hz - 20 kHz, +26 dBu Out

< 10 degrees deviation
Phase Response, Stereo Deviation  

35 dB Gain, 20 Hz - 40 kHz, +27 dBu Out

< 1 degree
Common Mode Rejection Ratio  

30 dB Gain, 1 kHz, 100 mV C.M.

> 60 dB
Slew Rate  

35 dB Gain, +27 dBu Out

> 20 Volts per microsecond
Maximum Input Level  

20 Hz - 40 kHz, 14 dB Gain

+20 dBu (no attenuator pads required)
Maximum Output Level  

20 Hz - 40 kHz, 10 kilohm Min. Load

> +35 dBu
Interchannel Crosstalk  

30 dB Gain, 1 kHz, 0 dBu Both Outputs

< 70 dB
Phantom Input Impedance 3.800 ohms
Output Impedance 120 ohms
DPA (B&K) Mic Powering +130 V dc max, (non-phantom)
Phantom Powering +48 V dc, +/- 2 V dc
Power Consumption 50 watts maximum
Power Requirements Selectable: 100-120, 200-240 V ac, 50/60 Hz
Dimensions/Shipping Weight 19” W x 3.5” H x 12” D, 26 lbs..
 
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