NJ7P SQL Tube Database Query

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6AX8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 6AE8 6GH8 6GJ8 6
Source ........................................ TungSol DS 05/01/65

Mechanical Data

Source ........................................ TungSol DS 05/01/65
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9AE
Mounting Position ............................. Any

Electrical Data

Source ........................................ TungSol DS 05/01/65
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ TungSol DS 05/01/65
Input ......................................... 5 pf
Output ........................................ 3.5 pf
Grid to Plate ................................. 0.006 pf

Triode
Source ........................................ TungSol DS 05/01/65
Input ......................................... 2.5 pf
Output ........................................ 1 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ TungSol DS 05/01/65
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Negative Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.8 W
Grid No. 2 Dissipation ........................ 0.5 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.1M Ω
Self Bias .................................. 0.5M Ω

Triode
Source ........................................ TungSol DS 05/01/65
Plate Voltage ................................. 300 V
Negative Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.7 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.1M Ω
Self Bias .................................. 0.5M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ TungSol DS 05/01/65
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 56 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 5K Ω
Transconductance .............................. 8500 µ
Plate Current ................................. 18 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -12 V

Pentode Class A Amplifier
Source ........................................ TungSol DS 05/01/65
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 120 Ω
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 4800 µ
Plate Current ................................. 10 mA
Grid No. 2 Current ............................ 3.5 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -12 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

Wed, 29 Mar 2023 00:46:28 -0700