NJ7P SQL Tube Database Query

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7B7
Remote-Cutoff Pentode

EIA Base & Outline

EIA Base: 8VEIA Bulb: 9-30

Substitute Data

Preferred Substitutes ......................... 7AH7
Substitutes ................................... 7A7 7AJ7 7H7 7T7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Glass lock-in type used as rf or if amplifier in radio receivers employing avc. Requires lock-in 8-contact socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-9
Base Type ..................................... Lock-in 8-Pin
EIA Outline ................................... 9-30
EIA Base ...................................... 8V
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947
Input ......................................... 5 pf
Output ........................................ 6 pf
Grid to Plate ................................. 0.007 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 750K Ω
Transconductance .............................. 1750 µMho
Plate Current ................................. 8.5 mA
Grid No. 2 Current ............................ 1.7 mA

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Tue, 28 Mar 2023 23:36:05 -0700