NJ7P SQL Tube Database Query

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7K7
Twin Diode-High-Mu Triode

EIA Base & Outline

Mechanical Data

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

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ ARRL HB - 1964
Input ......................................... 2.4 pf
Output ........................................ 2 pf
Grid to Plate ................................. 1.7 pf

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 70
Plate Resistance (approx) ..................... 44K Ω
Transconductance .............................. 1600 µ
Plate Current ................................. 2.3 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 04:59:16 -0700