NJ7P SQL Tube Database Query

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6BA8A
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6AW8 6BH8
Substitutes ................................... 6AU8 6JL8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in color and black-and-white television receiver applications. The pentode unit is used as an video amplifier, agc amplifier, or reactance tube.

Source ........................................ RCA RC-29 - 1975
The triode unit is used in low-frequency oscillator and phase-splitter 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
Shielded Unshielded
Input ......................................... 10 10 pf
Output ........................................ 3.6 4.5 pf
Grid to Plate ................................. 0.04 0.03 pf

Triode
Source ........................................ RCA RC-29 - 1975
Shielded Unshielded
Input ......................................... 2.5 2.7 pf
Output ........................................ 0.4 1.9 pf
Grid to Plate ................................. 2.2 2.2 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Negative Grid No. 1 Voltage ................... 50 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 3.25 W
Grid No. 2 Dissipation ........................ 1 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.25M Ω
Self Bias .................................. 1M Ω

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2 W
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.5M Ω
Self Bias .................................. 1M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 1 Voltage ............................ -8 V
Amplification Factor .......................... 18
Plate Resistance (approx) ..................... 6.7K Ω
Transconductance .............................. 2700 µ
Plate Current ................................. 8 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -16 V

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 9000 µ
Plate Current ................................. 13 mA
Grid No. 2 Current ............................ 3.5 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -10 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 00:27:09 -0700