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6AK5
Sharp-Cutoff Pentode

Base & Bulb ( TS DS 03/01/59)

Substitute Data

Preferred Substitutes ......................... 5591 5654
Substitutes ................................... 6AG5 6BC5 6CE5

Application

Miniature type used as rf or if amplifiers especially in high-frequency wide-band applications at frequencies up to 400 MHz. Requires miniature 7-contact socket.

Mechanical Data

Bulb .......................................... T-5 1/2
Base .......................................... Miniature Button 7-Pin
Outline ....................................... 5-1
EIA Base ...................................... 7BD
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.175 A
Maximum Heater-Cathode Voltage ................ 120 V

Direct Interelectrode Capacitances (approx)

Pentode
Shielded Unshielded
Input ......................................... 4.0 4.0 pf
Output ........................................ 2.8 2.1 pf
Grid to Plate ................................. 0.02 0.03 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 180 V
Grid No. 2 Supply Voltage ..................... 180 V
Grid No. 2 Voltage ............................ 140 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 1.7 W
Grid No. 2 Dissipation ........................ 0.5 W
Cathode Current ............................... 18 mA

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 120 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 180 Ω
Plate Resistance (approx) ..................... 500K Ω
Transconductance .............................. 5100 µ
Plate Current ................................. 7.7 mA
Grid No. 2 Current ............................ 2.4 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -8.5 V

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 120 V
Grid No. 2 Voltage ............................ 120 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 180 Ω
Plate Resistance (approx) ..................... 300K Ω
Transconductance .............................. 5000 µ
Plate Current ................................. 7.5 mA
Grid No. 2 Current ............................ 2.5 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -8.5 V

Characteristic Curves

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