NJ7P SQL Tube Database Query

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12DW7
Twin Triode

EIA Base & Outline

EIA Base: 9AEIA Bulb: 6-2

Substitute Data

Preferred Substitutes ......................... 12AX7 12DF7
Substitutes ................................... 12AD7 12BZ7
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 ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ ARRL HB - 1964
Input ......................................... 1.6 pf
Output ........................................ 0.44 pf
Grid to Plate ................................. 1.7 pf

Triode 2
Source ........................................ ARRL HB - 1964
Input ......................................... 1.7 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 1.5 pf

Characteristics and Typical Operation

Triode 1 Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 62.5K Ω
Transconductance .............................. 1600 µMho
Plate Current ................................. 1.2 mA

Triode 2 Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -8.5 V
Amplification Factor .......................... 17
Plate Resistance (approx) ..................... 7.7K Ω
Transconductance .............................. 2200 µMho
Plate Current ................................. 10.5 mA

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Sun, 28 Nov 2021 23:17:42 -0700