NJ7P SQL Tube Database Query

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12AX7
High-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 12DF7 12DM7
Substitutes ................................... 12AD7
Source ........................................ GE - 1973

Application

Source ........................................ GE - 1973
Miniature type used as phase inverter or amplifier in ac/dc radio equipment and in many diversified applications such a multivibrators or oscillators in industrial control devices. Requires noval 9-contact socket.

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9A
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Each Triode
Source ........................................ GE - 1973
Input ......................................... 1.8 pf
Output ........................................ 1.9 pf
Grid to Plate ................................. 1.7 pf

Maximum Ratings (Design Center Values)

Each Triode
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.2 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 62.5K Ω
Transconductance .............................. 1600 µ
Plate Current ................................. 1.2 mA

Source ........................................ GE - 1973
For other characteristics and typical operation, see 12AX7A

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

Tue, 21 Mar 2023 03:29:14 -0700