NJ7P SQL Tube Database Query

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12AZ7A
High-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 12AT7
Substitutes ................................... 12AU7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in direct-coupled cathode-drive rf amplifier circuits of vhf tv tuners. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
EIA Outline ................................... 6-2
EIA Base ...................................... 9A

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.45/0.225 A

Direct Interelectrode Capacitances (approx)

Each Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 3.1 pf
Output ........................................ 0.45 pf
Grid to Plate ................................. 1.9 pf

Maximum Ratings (Design Center Values)

Each Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 270 Ω
Amplification Factor .......................... 60
Plate Resistance (approx) ..................... 15K Ω
Transconductance .............................. 4000 µ
Plate Current ................................. 3.7 mA

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Amplification Factor .......................... 60
Plate Resistance (approx) ..................... 10.9K Ω
Transconductance .............................. 5500 µ
Plate Current ................................. 10 mA

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, 31 Jan 2023 10:38:56 -0700