NJ7P SQL Tube Database Query

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12DT7
High-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 12AX7 12DF7
Substitutes ................................... 12AD7 12BZ7 12DW7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
EIA Base ...................................... 9A

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Each Triode
Source ........................................ ARRL HB - 1964
Input ......................................... 1.6 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 1.7 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 300 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 62.5K Ω
Transconductance .............................. 1600 µ
Plate Current ................................. 1.2 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

Sat, 25 Mar 2023 03:52:15 -0700