NJ7P SQL Tube Database Query

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12DM7
Twin Triode

EIA Base & Outline

EIA Base: 9AEIA Bulb: 6-2

Substitute Data

Preferred Substitutes ......................... 12DW7 12DM7
Substitutes ................................... 12DT7 12AX7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
EIA Outline ................................... 6-2
EIA Base ...................................... 9A

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.26/0.13 A

Direct Interelectrode Capacitances (approx)

Each Triode
Source ........................................ ARRL HB - 1964
Input ......................................... 1.6 pf
Output ........................................ 0.39 pf
Grid to Plate ................................. 1.7 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ -1 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 80K Ω
Transconductance .............................. 1250 µMho
Plate Current ................................. 0.5 mA

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Fri, 19 Aug 2022 07:48:08 -0700