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Tube Substitutions for:
12AU7A
Medium Mu Duo Triode
TypeSubstitutesBase Diagram
12AU7A12AT7, 12AZ7, 12BH7, 12AU7, 12AX7§, 12AX7A§
Notes:§ - May not work in all circuits
Web References12AU7A (Mazda-Belvu) @ Franks Electron Tubes
12AU7A (RCA (HB3)) @ Franks Electron Tubes
12AU7A (Tung-Sol) @ Franks Electron Tubes
12AU7A (RCA (RC30)) @ Franks Electron Tubes
12AU7A (RCA (RC30)) @ Franks Electron Tubes
12AU7A @ RadioMuseum.org
RCA Type 12AU7A
MEDIUM-MU DUO TRIODE



MECHANICAL DATA

Bulb T-61/2
Base Small Button 9-Pin
Basing 9A
Mounting Position Any


ELECTRICAL DATA


HEATER CHARACTERISTICS
Heater Voltage Series/Parallel 12.6/6.3 Volts
Heater Current Series/Parallel 150/300 Ma
Max Heater-Cathode Voltage D.C. and Peak 200 Volts
Max Heater-Cathode Voltage D.C., Heater Positive 100 Volts

DIRECT INTERELECTRODE CAPACITIES
Grid to Plate Section 12 1.5 1.5 ��f
Grid to Plate Section 22 1.5 1.5 ��f
Input: (g to h + k) Section 1 1.8 1.6 ��f
Input: (g to h + k) Section 2 1.8 1.6 ��f
Output: (g to h + k) Section 1 2.0 0.40 ��f
Output: (g to h + k) Section 2 2.0 0.32 ��f

MAXIMUM RATINGS - Each Section(Design Center Values -- Except as Noted)
CLASS A1 AMPLIFIER
Plate Voltage 300 Volts
Plate Dissipation4 - Each Plate 2.75 Watts
Plate Dissipation4 - Both Plates 5.5 Watts
Average Cathode Current 20 Ma
Grid Circuit Resistance - Fixed Bias 0.25 Megohm
Grid Circuit Resistance - Cathode Bias 1.0 Megohm
Vertical Deflection Amplifier3
Plate Voltage 300 Volts
Peak Positive Plate Voltage 1200 Volts
Plate Dissipation4 - Each Plate 2.75 Watts
Plate Dissipation4 - Both Plates 5.5 Watts
Peak Negative Grid Voltage 250 Volts
Average Cathode Current 20 Ma
Peak Cathode Current 60 Ma
Grid Circuit Resistance - Cathode Bias 2.2 Megohms
Vertical Deflection Oscillator3
Plate Voltage 300 Volts
Plate Dissipation - Each Plate 2.75 Watts
Plate Dissipation - Both Plates 5.5 Watts
Peak Negative Grid Voltage 400 Volts
Average Cathode Current 20 Ma
Peak Cathode Current 60 Ma
Grid Circuit Resistance - Cathode Bias 2.2 Megohms
Horizontal Deflection Oscillator3
Plate Voltage 300 Volts
Plate Dissipation - Each Plate 2.75 Watts
Plate Dissipation - Both Plates 5.5 Watts
Peak Negative Grid Voltage 600 Volts
Average Cathode Current 20 Ma
Peak Cathode Current 300 Ma
Grid Circuit Resistance - Cathode Bias 2.2 Megohms

CHARACTERISTICS
CLASS A1 AMPLIFIER
Plate Voltage 100 250 Volts
Grid Voltage 0 -8.5 Volts
Plate Current 11.8 10.5 Ma
Plate Resistance (approx.) 6500 7700 Ohms
Transconductance 3100 2200 �mhos
Amplification Factor 20 17 X
Grid Voltage for Ib=10�a (approx.) -24 Volts

NOTES:

1 External shield No. 315 connected to cathode of section under test.
2 Section No. 1 connects to pins 6, 7 and 8. Section No. 2 connects to pins 1, 2 and 3.
3 For operation in a 525-line, 30 fram system, the duty cycle of the voltage pulse must not exceed 15% of one scanning cycle.
4 In stages operating with grid leak bias, an adequate cathode bias resistor or other suitable means is required to protect the tube in the absence of excitation.


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