NJ7P SQL Tube Database Query

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6J4
Grounded Grid Triode

EIA Base & Outline

EIA Base: 7BQEIA Bulb: 5-2

Substitute Data

Preferred Substitutes ......................... 8532
Substitutes ................................... 7137 7245
Source ........................................ TungSol

Application

Source ........................................ TungSol
Miniature type used as a grounded-grid UHF amplifier at frequencies up to 500 MHz. Requires miniature 7-contact socket.

Mechanical Data

Source ........................................ TungSol
Bulb .......................................... T-5 1/2
EIA Outline ................................... 5-2
EIA Base ...................................... 7BQ

Electrical Data

Source ........................................ TungSol
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.4 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ TungSol
Input ......................................... 7.5 pf
Output ........................................ 3.9 pf
Grid to Plate ................................. 0.12 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ TungSol
Plate Voltage ................................. 150 V
Plate Dissipation ............................. 2.25 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ TungSol
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 55
Transconductance .............................. 12K µMho
Plate Current ................................. 15 mA

Class A Amplifier
Source ........................................ TungSol
Plate Voltage ................................. 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Amplification Factor .......................... 55
Transconductance .............................. 11K µMho
Plate Current ................................. 10 mA

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Mon, 27 Jun 2022 08:00:14 -0700