NJ7P SQL Tube Database Query

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6LB8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

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 µ
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 µ
Plate Current ................................. 17 mA
Grid No. 2 Current ............................ 3.5 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

Mon, 03 Oct 2022 05:08:22 -0700