NJ7P SQL Tube Database Query

A horizontal ribbon.

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

A horizontal ribbon.

6LB8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9DXEIA Bulb: 9-69

Substitute Data

Preferred Substitutes ......................... 6JT8
Substitutes ................................... 6EB8 6GN8 6HF8 6JE8 6JT8 6LY8

Mechanical Data

Bulb .......................................... T-9
EIA Outline ................................... 9-69
EIA Base ...................................... 9DX

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.725 A

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 68 Ω
Plate Resistance (approx) ..................... 6000 Ω
Transconductance .............................. 5000 µMho
Plate Current ................................. 13 mA

Pentode Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 82 Ω
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 20K µMho
Plate Current ................................. 17 mA
Grid No. 2 Current ............................ 3.5 mA

A horizontal ribbon.

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.

Please enter the tube number:

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

A horizontal ribbon.

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

Sun, 26 Jun 2022 03:41:51 -0700