NJ7P SQL Tube Database Query

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6BF7A
Medium-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BG7
Substitutes ................................... 6947 7079 7963
Source ........................................ TungSol

Application

Source ........................................ TungSol
Subminiature type used in similar function to type 6J6, but provides added flexability from use of separate cathode leads and the compact construction.

Mechanical Data

Source ........................................ TungSol
Bulb .......................................... T-3
EIA Outline ................................... 3-2
EIA Base ...................................... 8DG

Electrical Data

Source ........................................ TungSol
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Triode 1
Source ........................................ TungSol
Input ......................................... 2.0 pf
Output ........................................ 1.6 pf
Grid to Plate ................................. 1.5 pf

Triode 2
Source ........................................ TungSol
Input ......................................... 2.0 pf
Output ........................................ 2.0 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Triode 1
Source ........................................ TungSol
Plate Voltage ................................. 120 V
Plate Dissipation ............................. 1.1 W

Triode 2
Source ........................................ TungSol
Plate Voltage ................................. 120 V
Plate Dissipation ............................. 1.1 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ TungSol
Plate Voltage ................................. 110 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 35
Plate Resistance (approx) ..................... 7K Ω
Transconductance .............................. 4800 µ
Plate Current ................................. 8.0 mA

Source ........................................ TungSol
For other characteristics and typical operation, see 6BF7

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, 02 Feb 2023 23:56:53 -0700