NJ7P SQL Tube Database Query

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A horizontal ribbon.

6AU8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9DXEIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 6BA8 6BH8
Substitutes ................................... 6AW8 6JL8 6LB8
Source ........................................ TungSol

Application

Source ........................................ TungSol
Miniature type used in television receiver applications. Pentode unit is used as video amplifier, if amplifier, and agc amplifier. Triode unit is used in sync-inverter circuits. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ TungSol
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-3
EIA Base ...................................... 9DX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ TungSol
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.6 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)

Pentode
Source ........................................ TungSol
Input ......................................... 7.5 pf
Output ........................................ 2.4 pf
Grid to Plate ................................. 0.044 pf

Triode
Source ........................................ TungSol
Input ......................................... 2.6 pf
Output ........................................ 0.34 pf
Grid to Plate ................................. 2.2 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ TungSol
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 3 W
Grid No. 2 Dissipation ........................ 1 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 1M Ω
Self Bias .................................. 1M Ω

Triode
Source ........................................ TungSol
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.5 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.5M Ω
Self Bias .................................. 0.25M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ TungSol
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 8.2K Ω
Transconductance .............................. 4900 µMho
Plate Current ................................. 9 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -6.5 V

Pentode Class A Amplifier
Source ........................................ TungSol
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 82 Ω
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 7000 µMho
Plate Current ................................. 15 mA
Grid No. 2 Current ............................ 3.4 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -8.0 V

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A horizontal ribbon.

(c) 1994-2021 by William A. Beech, NJ7P

Tue, 31 Jan 2023 09:22:51 -0700