NJ7P SQL Tube Database Query

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7AH7
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 8VEIA Bulb: 9-30

Substitute Data

Preferred Substitutes ......................... 7AG7
Substitutes ................................... 7G7 7H7 7T7 7V7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
Bulb .......................................... T-9
Base Type ..................................... Lock-in 8-Pin
EIA Outline ................................... 9-30
EIA Base ...................................... 8V

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.15 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ ARRL HB - 1964
Input ......................................... 7 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.005 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 250 Ω
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 3300 µMho
Plate Current ................................. 6.8 mA
Grid No. 2 Current ............................ 1.9 mA

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Sat, 01 Oct 2022 22:55:58 -0700