NJ7P SQL Tube Database Query

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6AF4A
UHF Medium-Mu Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6T4
Substitutes ................................... 6AN4 6DX4 6DZ4
Source ........................................ GE DS 12/56

Application

Source ........................................ GE DS 12/56
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

Source ........................................ GE DS 12/56
Bulb .......................................... T-5 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 5-1
EIA Base ...................................... 7DK
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE DS 12/56
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
Source ........................................ GE DS 12/56
Input ......................................... 2.2 pf
Output ........................................ 0.45 pf
Grid to Plate ................................. 1.9 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ GE DS 12/56
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
Source ........................................ GE DS 12/56
Plate Voltage ................................. 80 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 15
Plate Resistance (approx) ..................... 2270 Ω
Transconductance .............................. 6600 µ
Plate Current ................................. 15 mA

CTO (1000 MHz)
Source ........................................ GE DS 12/56
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 10K Ω
Grid No. 1 Current ............................ 0.75 mA
Plate Current ................................. 17 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Tue, 21 Mar 2023 05:01:52 -0700