NJ7P SQL Tube Database Query

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6BK7B
Medium-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6FW8 6KN8
Substitutes ................................... 6AQ8 6BC8 6BQ7 6BZ7 6BZ8 6CH7 6CX7
Source ........................................ GE DS 12/61

Application

Source ........................................ GE DS 12/61
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 ........................................ GE DS 12/61
Bulb .......................................... T-6 1/2
Base Type ..................................... E9-1 Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9AJ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE DS 12/61
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Heater Warm-up Time ........................... 11 s
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V
Heater Negative with Respect to Cathode
Total DC and Peak ....................... 200 V

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ GE DS 12/61
Input ......................................... 3.0 pf
Output ........................................ 1.0 pf
Grid to Plate ................................. 1.8 pf

Triode 2
Source ........................................ GE DS 12/61
Input ......................................... 3.0 pf
Output ........................................ 0.9 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ GE DS 12/61
Plate Voltage ................................. 300 V
Negative Grid No. 1 Voltage ................... -50 V
Plate Dissipation ............................. 2.7 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ GE DS 12/61
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Amplification Factor .......................... 43
Plate Resistance (approx) ..................... 4.6K Ω
Transconductance .............................. 9300 µ
Plate Current ................................. 18 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -11 V

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

Thu, 30 Jun 2022 06:14:01 -0700