NJ7P SQL Tube Database Query

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6AM4
UHF High-Mu Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6AJ4
Substitutes ................................... 6CR4
Source ........................................ GE DS 12/56

Application

Source ........................................ GE DS 12/56
Miniature type used as vhf/uhf amplifier in radio and tv receivers. Requires miniature 7-contact socket.

Mechanical Data

Source ........................................ GE DS 12/56
Bulb .......................................... T-6 1/2
Base Type ..................................... E9-1 Small Button 9-Pin
EIA Outline ................................... 6-1
EIA Base ...................................... 9BX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ GE DS 12/56
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.225 A
Maximum Heater-Cathode Voltage ................ 80 V

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ GE DS 12/56
Input ......................................... 4.4 pf
Output ........................................ 0.16 pf
Grid to Plate ................................. 2.4 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ GE DS 12/56
Plate Voltage ................................. 200 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.0 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ GE DS 12/56
Plate Voltage ................................. 200 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 85
Plate Resistance (approx) ..................... 8700 Ω
Transconductance .............................. 9800 µ
Plate Current ................................. 10 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -6.5 V

Class A Amplifier
Source ........................................ GE DS 12/56
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 90
Plate Resistance (approx) ..................... 10K Ω
Transconductance .............................. 9000 µ
Plate Current ................................. 7.5 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

Thu, 02 Feb 2023 05:23:59 -0700