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Model: 426B31

$810.00 USD
(Pricing valid in US only)


1/4" preamplifier with 7-pin LEMO conn. (for externally polarized microphones)

  • Nominal Microphone Diameter: 1/4"
  • Temperature Range: -4 to 167 °F (-20 to 75 °C)
  • Output Voltage: ±50 V
  • Size - Length: 4 in (101.6 mm)

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Nominal Microphone Diameter1/4"1/4" 
Gain (1 )-0.14 dB-0.14 dB[1][2] 
Frequency Response (±0.5 dB)3.98 to 126000 Hz3.98 to 126000 Hz[1] 
Frequency Response (±0.3 dB)5.01 to 126000 Hz5.01 to 126000 Hz[1] 
Frequency Response (±0.2 dB)6.31 to 126000 Hz6.31 to 126000 Hz[1] 
Frequency Response (±0.1 dB)10.0 to 126000 Hz10.0 to 126000 Hz[1] 
Phase Linearity (±1 °)79.42 to 25000 Hz79.42 to 25000 Hz[1] 
Electrical Noise (A-weight)3.8 µV3.8 µV[1][2] 
Electrical Noise (A-weight)≤4.8 µV≤4.8 µV[1] 
Electrical Noise (Flat 20 Hz to 20 kHz)9.3 µV9.3 µV[1][2] 
Electrical Noise (Flat 20 Hz to 20 kHz)≤12.0 µV≤12.0 µV[1] 
Distortion (25 V rms input at 1 kHz)<-80 dB<-80 dB 
Output Slew Rate8 V/µS8 V/µS[2] 
TEDS CompliantYesYes 
Temperature Range (Operating)-4 to 167 °F-20 to 75 °C[3] 
Temperature Range (Storage)-40 to 185 °F-40 to 85 °C 
Humidity Range (Non-Condensing)0 to 95 %RH0 to 95 %RH 
Excitation Voltage (Single Supply)28 to 120 V28 to 120 V 
Excitation Voltage (Dual Supply)±14 to 60 V±14 to 60 V 
Current Draw3.3 mA3.3 mA[2] 
Impedance (Input)19.1 GOhm19.1 GOhm[2] 
Capacitance (Input)0.18 pF0.18 pF[2] 
Output Bias Voltage (Dual Supply)1.2 VDC1.2 VDC[2] 
Impedance (Output)<40 Ohm<40 Ohm 
Output Voltage (Maximum)±50 V±50 V 
Output Current (Maximum)20 mA20 mA[2] 
Housing MaterialStainless SteelStainless Steel 
Size - Diameter0.25 in6.35 mm 
Size - Length4 in101.6 mm 
Electrical ConnectorIntegral CableIntegral Cable 
Electrical Connector7-pin LEMO FGG.1B.3077-pin LEMO FGG.1B.307 
Cable Length10 ft3 m 
Mounting Thread (Microphone to Preamplifier)0.2244 - 60 UNS5.7 mm - 60 UNS 

All specifications are at room temperature unless otherwise specified.

Product Notes
[1] Measured with an equivalent microphone of 6.8 pF
[2] Typical.
[3] With Power Supply < ±18 VDC
ERC-16Calibration of microphone preamplifier(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones