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Model: 426A30

$650.00 USD
(Pricing valid in US only)


1/2-inch preamplifier with 7-pin LEMO conn. (for externally polarized microphones)

  • Nominal Microphone Diameter: 1/2"
  • Temperature Range: -40 to +185 °F (-40 to +85 °C)
  • Output Voltage: 28 Vpp
  • Size - Length: 5.2 in (132 mm)

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Nominal Microphone Diameter1/2"1/2" 
Gain-0.2 dB-0.2 dB[1] 
Frequency Response (±0.10 dB)10 to 126000 Hz10 to 126000 Hz[2] 
Frequency Response (-0.5 to +0.10 dB)3 to 10 Hz3 to 10 Hz[2] 
Frequency Response (-3 dB)<1.2 Hz<1.2 Hz[2] 
Electrical Noise (A-weight)<2.8 µV<2.8 µV[2] 
Electrical Noise (Flat 20 Hz to 20 kHz)<5.0 µV<5.0 µV[2] 
Distortion (6 V rms input at 1 kHz)<-70 dBc<-70 dBc 
Output Slew Rate8 V/µS8 V/µS[1] 
Temperature Range (Operating)-40 to +185 °F-40 to +85 °C 
Temperature Response (-40 to +149 °F (-40 to +65 °C))<0.05 dB<0.05 dB 
Humidity Range (Non-Condensing)0 to 90 %RH0 to 90 %RH 
Humidity Sensitivity (at +104 °F (+40 °C))<0.05 dB<0.05 dB 
Excitation Voltage (Dual Supply)±10 to ±18 V±10 to ±18 V 
Excitation Voltage (Single Supply)20 to 150 V20 to 150 V 
Current Draw<1.7 mA<1.7 mA[1] 
Impedance (Input)10000000000 Ohm10000000000 Ohm[1] 
Capacitance (Input)0.36 pF0.36 pF[1] 
Output Bias Voltage (Dual Supply)≤1 VDC≤1 VDC 
Output Bias Voltage (Single Supply)17 VDC17 VDC[1] 
Impedance (Output)<50 Ohm<50 Ohm 
Output Voltage (with +36 V power supply)28 Vpp28 Vpp 
Output Current≤20 mA≤20 mA 
Housing MaterialStainless SteelStainless Steel 
Size - Diameter0.5 in12.7 mm 
Size - Length5.2 in132 mm 
Electrical Connector7-pin LEMO FGG.1B.3077-pin LEMO FGG.1B.307 
Mounting Thread (Microphone to Preamplifier)0.4606 - 60 UNS11.7 mm - 60 UNS 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] Measured with an 18 pF reference microphone.
[3] See PCB Declaration of Conformance PS083 for details.
No Accessories
Optional Versions:
No optional versions
Product Documents
Additional Downloads
Microphone - Safe Handling and Maintenance

Prepolarized vs. externally polarized microphones