NJ7P SQL Tube Database Query

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12AU7A
Medium-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 12AT7
Substitutes ................................... 12AZ7 12BH7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
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-29 - 1975
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-29 - 1975
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-29 - 1975
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ RCA RC-29 - 1975
Input ......................................... 1.6 pf
Output ........................................ 0.5 pf
Grid to Plate ................................. 1.5 pf

Triode 2
Source ........................................ RCA RC-29 - 1975
Input ......................................... 1.6 pf
Output ........................................ 0.35 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Triode 1
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.75 W

Triode 2
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.75 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 19.5
Plate Resistance (approx) ..................... 6.25K Ω
Transconductance .............................. 3100 µ
Plate Current ................................. 11.8 mA

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -8.5 V
Amplification Factor .......................... 17
Plate Resistance (approx) ..................... 7.7K Ω
Transconductance .............................. 2200 µ
Plate Current ................................. 10.5 mA

Class C Oscillator/Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 7 mA
Plate Current ................................. 24 mA
Power Output (approx) ......................... 6.0 W

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Wed, 08 Feb 2023 22:38:56 -0700