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6LU8
High-Mu Triode - Beam Power Tube

Base & Bulb ( GE DS 01/67)

Application

Duodecar type used in combined vertical-deflection oscillator and amplifier in color tv receivers. Requires Duodecar 12-contact socket.

Mechanical Data

Bulb .......................................... T-12
Base .......................................... E12-74 Button 12-Pin
Outline ....................................... 12-57
EIA Base ...................................... 12DZ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.5 A
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
Input ......................................... 16.0 pf
Output ........................................ 9.0 pf
Grid to Plate ................................. 0.5 pf

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 7.0 pf
Output ........................................ 2.0 pf
Grid to Plate ................................. 6.0 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 14 W
Grid No. 2 Dissipation ........................ 2.75 W
Cathode Current ............................... 260 mA
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 1M Ω
Self Bias ................................... 2.2M Ω

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 400 V
Negative Grid No. 1 Voltage ................... -400 V
Plate Dissipation ............................. 2.5 W
Cathode Current ............................... 105 mA
Grid No. 1 Circuit Resistance
Self Bias ................................... 2.2M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -4 V
Amplification Factor .......................... 58
Plate Resistance (approx) ..................... 16K Ω
Transconductance .............................. 3600 µ
Plate Current ................................. 2.3 mA
Grid No. 2 Current (Maximum Signal) ........... -6.6 mA

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 120 V
Grid No. 1 Voltage ............................ -10 V
Plate Resistance (approx) ..................... 12K Ω
Transconductance .............................. 9300 µ
Plate Current ................................. 56 mA
Grid No. 2 Current (Zero Signal) .............. 3.0 mA
Grid No. 2 Current (Maximum Signal) ........... -30 mA

Characteristics and Typical Operation

Vert Defl Amplifier
DC Plate Supply Voltage ....................... 400 V
Peak Positive-Pulse Plate Voltage ............. 2500 V
DC Grid No. 2 Voltage ......................... 300 V
Peak Negative-Pulse Grid No. 1 Voltage ........ 250 V
Average Cathode Current ....................... 75 mA
Peak Cathode Current .......................... 260 mA
Plate Dissipation ............................. 14 W
Grid No. 2 Dissipation ........................ 2.75 W

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