NJ7P SQL Tube Database Query

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7AK7
Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Substitutes ................................... 7G7 7T7
Source ........................................ ARRL HB - 1964

Mechanical Data

Source ........................................ ARRL HB - 1964
EIA Outline ................................... 9-30
EIA Base ...................................... 8V

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.8 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ ARRL HB - 1964
Input ......................................... 12 pf
Output ........................................ 9.5 pf
Grid to Plate ................................. 0.7 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 150 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ 0 V
Plate Resistance (approx) ..................... 11.5K Ω
Transconductance .............................. 5500 µ
Plate Current ................................. 41 mA
Grid No. 2 Current ............................ 21 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Sat, 25 Mar 2023 04:48:04 -0700