NJ7P SQL Tube Database Query

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9BR7
Twin Diode - High-Mu Triode

EIA Base & Outline

EIA Base: 9CFEIA Bulb: 6-2

Mechanical Data

EIA Outline ................................... 6-2
EIA Base ...................................... 9CF

Electrical Data

Heater Voltage ................................ 4.7/9.4 V
Heater Current ................................ 0.6/0.3 A

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Amplification Factor .......................... 60
Plate Resistance (approx) ..................... 10900 Ω
Transconductance .............................. 4000 µMho
Plate Current ................................. 10 mA

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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.

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This database contains data on thousands of tubes. Every effort has been made to insure the accuracy of this reference, however, I assume no liability for the results of using information contained herein.

Other Tube Search Engines:
Frank's Electron Tube Pages

Complete Tube Manuals:
Tube Manual Index from NJ7P

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Mon, 03 Oct 2022 17:20:52 -0700