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6BA11
Medium-Mu Triode - Twin Pentode

Base & Bulb ( RCA RC-29 - 1975)

Application

Duodecar type used as vertical-deflection oscillator and for combined sync-agc applications in color and black-and-white television receivers. Requires duodecar 12-contact socket.

Mechanical Data

Bulb .......................................... T-9
Outline ....................................... 9-58
EIA Base ...................................... 12ER
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

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)

Triode
Input ......................................... 2 pf
Output ........................................ 1.9 pf
Grid to Plate ................................. 2 pf

Direct Interelectrode Capacitances (approx)

Pentode
Grid No. 3 to Plate ........................... 2.0 pf
Grid No. 1 to All Except Plate (Input) ........ 6.0 pf
Grid No. 3 to All (Input) ..................... 3.6 pf
Grid No. 1 to Grid No. 3 ...................... 0.026 pf
Plate to All (Output) ......................... 3.0 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 1.5 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 0.25M Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 300 V
Positive Grid No. 3 Voltage ................... 3 V
Negative Grid No. 3 Voltage ................... 50 V
Grid No. 2 Voltage ............................ 150 V
Negative Grid No. 1 Voltage ................... 50 V
Plate Dissipation ............................. 1.1 W
Grid No. 2 Dissipation ........................ 0.75 W
Grid No. 3 Circuit Resistance ................. 0.5M Ω
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 0.5M Ω
Self Bias ................................... 0.5M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -11 V
Amplification Factor .......................... 18
Transconductance .............................. 1800 µ
Plate Current ................................. 5.0 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -18 V

Characteristics and Typical Operation

Pentode
Plate Voltage ................................. 100 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 1700 Ω
Grid No. 1 Transconductance ................... 450 µ
Grid No. 3 Transconductance ................... 2.5 µ
Grid No. 2 Current ............................ -2.3 mA
Grid No. 1 Voltage for Ib ..................... -3.2 µa @ 100 V
Grid No. 3 Voltage for Ib ..................... µa @ 100 V

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