Vacuum Tube Data Sheets

12AX7 / ECC83

MAXIMUM RATINGS (Each Section)

Design Center Values

Zero Signal Plate Voltage 550 volts
Plate Voltage 300 volts
Plate Dissipation 1.0 watt
Cathode Current 8 mA
Grid Voltage -50 volts
Grid Voltage (Grid current = + 0.3 uA) -1.3 volts
Grid Resistance4 2 megohms
Heater to Cathode Voltage 180 volts
Heater to Cathode Resistance 20,000 ohms
Heater to Cathode Resistance5 150,000 ohms

Typical Operating Conditions

Class A Amplifier (Each Section)

Plate Voltage 100 250 volts
Grid Voltage -1.0 -2.0 volts
Amplification Factor 100 100
Plate Resistance (approx.) 80,000 62,500 ohms
Transconductance 1250 1600 micromhos
Plate Current 0.5 1.2 mA

  12ax7 class A amplifier

4 With self bias.

  5 In phase inverting circuits.

Vacuum Tube Data Sheets

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