NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

5879
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9ADEIA Bulb: 6-2
Source ........................................ RCA RC-29 - 1975

Application

Miniature type used as audio amplifier in the input stages of medium-gain public-address systems, home sound recorders, and audio systems. Requires miniature 9-contact socket.

Mechanical Data

EIA Outline ................................... 6-2
EIA Base ...................................... 9AD

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 2.7 pf
Output ........................................ 2.4 pf
Grid to Plate ................................. 0.15 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 1.25 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 2M Ω
Transconductance .............................. 1000 µMho
Plate Current ................................. 1.8 mA
Grid No. 2 Current ............................ 0.4 mA

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 21
Plate Resistance (approx) ..................... 17K Ω
Transconductance .............................. 1240 µMho
Plate Current ................................. 2.2 mA

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -8 V
Amplification Factor .......................... 21
Plate Resistance (approx) ..................... 13.7K Ω
Transconductance .............................. 1530 µMho
Plate Current ................................. 5.5 mA

A horizontal ribbon.

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A horizontal ribbon.

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Tue, 28 Jun 2022 01:40:12 -0700