NJ7P SQL Tube Database Query

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7H7
Semiremote-Cutoff Pentode

EIA Base & Outline

EIA Base: 8VEIA Bulb: 9-30

Substitute Data

Preferred Substitutes ......................... 7T7
Substitutes ................................... 7A7 7AG7 7AH7 7V7
Source ........................................ RCA RC-15 - 1947

Application

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

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -1.5 V
Plate Resistance (approx) ..................... 350K Ω
Transconductance .............................. 4000 µMho
Plate Current ................................. 7.5 mA
Grid No. 2 Current ............................ 2.6 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 800K Ω
Transconductance .............................. 4000 µMho
Plate Current ................................. 10 mA
Grid No. 2 Current ............................ 3.2 mA

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Fri, 12 Aug 2022 14:26:03 -0700