NJ7P SQL Tube Database Query

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6AJ4
UHF Medium-Mu Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6AM4
Substitutes ................................... 6CR4
Source ........................................ TS DS 12/01/53

Application

Source ........................................ TS DS 12/01/53
Miniature type used as a grounded grid amplifier in television tuners in the UHF region.

Mechanical Data

Source ........................................ TS DS 12/01/53
Bulb .......................................... T-6 1/2
Base Type ..................................... Miniature Button 9-Pin
EIA Outline ................................... 6-1
EIA Base ...................................... 9BX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ TS DS 12/01/53
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.225 A
Maximum Heater-Cathode Voltage ................ 80 V

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ TS DS 12/01/53
Input ......................................... 4.4 pf
Output ........................................ 0.18 pf
Grid to Plate ................................. 2.4 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ TS DS 12/01/53
Plate Voltage ................................. 150 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2 W
Cathode Current ............................... 20 mA

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ TS DS 12/01/53
Plate Voltage ................................. 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Amplification Factor .......................... 42
Plate Resistance (approx) ..................... 4200 Ω
Transconductance .............................. 10K µ
Plate Current ................................. 16 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -9 V

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

Thu, 02 Feb 2023 05:24:35 -0700