NJ7P SQL Tube Database Query

Note: Please do not link down into my pages. I change this directory structure often and your links will not work correctly.

7AH7
Sharp-Cutoff Pentode

EIA Base & Outline

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 µ
Plate Current ................................. 6.8 mA
Grid No. 2 Current ............................ 1.9 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

Tue, 31 Jan 2023 09:20:20 -0700