6AF4

Small Signal Triode — B7G

Tung-Sol

Known Equivalents & Substitutes

6AF4AEC94

Similar Tubes (Not Drop-In Compatible)

2AF4

Same UHF triode with 2.34V heater — not interchangeable without heater change

3AF4

Same UHF triode with 3.15V heater — not interchangeable without heater change

6AN4

Similar UHF triode oscillator on B7G base — Sams lists as substitute

Electrical Specifications

Absolute Maximum

Anode Voltage (max)Max Plate Voltage150V

Anode Dissipation (max)Max Plate Dissipation2.5W

Typical Operating

Anode Voltage (typical)Plate Voltage80V

Anode CurrentPlate Current13.5mA

Anode ResistancePlate Resistance2,100Ω

TransconductanceTransconductance6.5mA/V

Heater

Heater VoltageHeater Voltage6.3V

Heater CurrentHeater Current0.225A

Notes

GE Essential Characteristics classifies as UHF Triode Oscillator: Va=80V, Ia=13.5mA, gm=6500 umhos, Rp=2100 ohms, Pa_max=2.5W, Va_max=150V.
Designed specifically for UHF TV tuner local oscillator use in the 470-890 MHz range.
Sams Substitution Handbook lists 6AF4A, 6AN4, EC94, ECLL800 as substitutes.
Muiderkring Handbook page 136 lists this type.

Pin Layout — B7G

1Grid

2Cathode

3Heater

4

References