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6AF4
UHF Medium-Mu Triode

Base & Bulb ( GE DS 1/56)

Substitute Data

Preferred Substitutes ......................... 6T4
Substitutes ................................... 6AN4 6DX4 6DZ4

Application

Miniature type used as local oscillators in uhf television receivers covering the frequency range of 470 to 890 MHz. Requires miniature 7-contact socket.

Mechanical Data

Bulb .......................................... T-5 1/2
Base .......................................... Miniature Button 7-Pin
Outline ....................................... 5-2
EIA Base ...................................... 7DK
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.225 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
Total DC and Peak ......................... 50 V
Heater Negative with Respect to Cathode
Total DC and Peak ......................... 50 V

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 2.2 pf
Output ........................................ 0.45 pf
Grid to Plate ................................. 1.9 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 150 V
Negative Grid No. 1 Voltage ................... -50 V
Plate Dissipation ............................. 2.5 W
Grid Current .................................. 2.0 mA
Cathode Current ............................... 22 mA

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 80 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 150 Ω
Amplification Factor .......................... 13.5
Plate Resistance (approx) ..................... 2100 Ω
Transconductance .............................. 6500 µ
Plate Current ................................. 17.5 mA

Characteristics and Typical Operation

CTO (1000 MHz)
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ......................... 20K Ω
Grid No. 1 Current ............................ 0.75 mA
Plate Current ................................. 17 mA

Characteristic Curves

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