NJ7P SQL Tube Database Query

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6AU8A
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BA8 6BH8
Substitutes ................................... 6AW8 6JL8 6LB8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
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 ........................................ RCA RC-29 - 1975
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 ........................................ RCA RC-29 - 1975
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 ........................................ RCA RC-29 - 1975
Input ......................................... 7.5 pf
Output ........................................ 3.4 pf
Grid to Plate ................................. 0.06 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.6 pf
Output ........................................ 0.34 pf
Grid to Plate ................................. 2.2 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.3 W
Grid No. 2 Dissipation ........................ 1 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 1M Ω
Self Bias .................................. 1M Ω

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.8 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 ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 43
Plate Resistance (approx) ..................... 8.1K Ω
Transconductance .............................. 5300 µ
Plate Current ................................. 9.5 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -6.5 V

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 82 Ω
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 8000 µ
Plate Current ................................. 17 mA
Grid No. 2 Current ............................ 3.4 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -7.5 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 00:07:08 -0700