NJ7P SQL Tube Database Query

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6CL8
Medium-Mu Triode - Sharp-Cutoff Tetrode

EIA Base & Outline

EIA Base: 9FXEIA Bulb: 6-2

Substitute Data

Substitutes ................................... 6BR8 6FV8 6JN8

Application

Miniature type used as combined vhf oscillator and mixer in color and black-and-white television receivers.

Mechanical Data

Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9FX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Tetrode
Input ......................................... 5 pf
Output ........................................ 2 pf
Grid to Plate ................................. 0.02 pf

Triode
Input ......................................... 2.8 pf
Output ........................................ 1.5 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Tetrode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.0 W
Grid No. 2 Dissipation ........................ 0.55 W

Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 300 V
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 5K Ω
Transconductance .............................. 8000 µMho
Plate Current ................................. 15 mA

Tetrode Class A Amplifier
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 6400 µMho
Plate Current ................................. 12 mA
Grid No. 2 Current ............................ 4 mA

Triode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 1 Voltage ............................ -1.0 V
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 5K Ω
Transconductance .............................. 8000 µMho
Plate Current ................................. 14 mA

Pentode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -1.0 V
Plate Resistance (approx) ..................... 120K Ω
Transconductance .............................. 6000 µMho
Plate Current ................................. 12 mA
Grid No. 2 Current ............................ 4 mA

For other characteristics and typical operation, see 6CL8A

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Mon, 04 Jul 2022 16:43:41 -0700