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12AU7
Medium-Mu Twin Triode

EIA Base & Outline

EIA Base: 9AEIA Bulb: 6-2

Substitute Data

Preferred Substitutes ......................... 12AT7
Substitutes ................................... 12AZ7 12BH7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Miniature type used as phase inverters or push-pull amplifiers in ac/dc radio equipment and as multivibrators or oscillators in industrial control devices.

Source ........................................ RCA RC-15 - 1947
Also used as combined vertical oscillatora and vertical-deflection amplifiers, and as horizontal-deflection oscillators in tv receivers. requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9A
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ RCA RC-15 - 1947
Input ......................................... 1.6 pf
Output ........................................ 0.5 pf
Grid to Plate ................................. 1.5 pf

Triode 2
Source ........................................ RCA RC-15 - 1947
Input ......................................... 1.6 pf
Output ........................................ 0.35 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Triode 1
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.75 W

Triode 2
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.75 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 19.5
Plate Resistance (approx) ..................... 6.25K Ω
Transconductance .............................. 3100 µMho
Plate Current ................................. 11.8 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -8.5 V
Amplification Factor .......................... 17
Plate Resistance (approx) ..................... 7.7K Ω
Transconductance .............................. 2200 µMho
Plate Current ................................. 10.5 mA

Source ........................................ RCA RC-15 - 1947
For other characteristics and typical operation, see 12AU7A

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Fri, 24 Jun 2022 19:22:34 -0700