NJ7P SQL Tube Database Query

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6BK7
Medium-Mu Twin Triode

EIA Base & Outline

EIA Base: 9AJEIA Bulb: 6-2

Substitute Data

Preferred Substitutes ......................... 6FW8 6KN8
Substitutes ................................... 6AQ8 6BC8 6BQ7 6BZ7 6BZ8 6CH7 6CX7
Source ........................................ Sylvania

Application

Source ........................................ Sylvania
Miniature type used as a cascode amplifier in vhf color and black-and-white television tuners and in push-pull cathode-drive rf amplifiers. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ Sylvania
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9AJ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ Sylvania
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ Sylvania
Input ......................................... 3.0 pf
Output ........................................ 1.1 pf
Grid to Plate ................................. 1.9 pf

Triode 2
Source ........................................ Sylvania
Input ......................................... 3.0 pf
Output ........................................ 1.0 pf
Grid to Plate ................................. 1.9 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ Sylvania
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.7 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ Sylvania
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 4.7K Ω
Transconductance .............................. 8500 µMho
Plate Current ................................. 18 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -12 V

Class A Amplifier
Source ........................................ Sylvania
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 120 Ω
Amplification Factor .......................... 37
Plate Resistance (approx) ..................... 6.1K Ω
Transconductance .............................. 6100 µMho
Plate Current ................................. 9 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -9 V

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Fri, 12 Aug 2022 15:14:12 -0700