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6T4
Low-Mu Triode

Base & Bulb ( Sylvania 1959)

Substitute Data

Preferred Substitutes ......................... 6AF4
Substitutes ................................... 6AN4 6AF4 6DX4

Application

Miniature type used as an oscillator in UHF television applications. Requires miniature 7-contact socket.

Mechanical Data

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

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.225 A

Direct Interelectrode Capacitances (approx)

Triode
Shielded Unshielded
Input ......................................... 3.3 2.6 pf
Output ........................................ 2.0 0.4 pf
Grid to Plate ................................. 1.7 1.7 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 200 V
Plate Dissipation ............................. 3.5 W
Cathode Current ............................... 30 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
Plate Resistance (approx) ..................... 1860 Ω
Transconductance .............................. 7000 µ
Plate Current ................................. 18 mA

Characteristics and Typical Operation

Class C Oscillator (950 MHz)
Plate Voltage ................................. 80 V
Grid No. 1 Voltage ............................ -4 V
Plate Current ................................. 18 mA

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