NJ7P SQL Tube Database Query

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6LM8
Medium-Mu Triode - Semi-Remote-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6GH8
Substitutes ................................... 6AX8 6EA8 6GJ8 6HL8 6KD8 6U8

Application

Miniature type used in color and bw tv receivers. The pentode is used in burst-amplifier circuits, and the triode as a general-purpose amplifier tube. Requires miniature 9-contact socket.

Mechanical Data

Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-2
EIA Base ...................................... 9AE

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 5.5 pf
Output ........................................ 3.8 pf
Grid to Plate ................................. 0.015 pf

Triode
Input ......................................... 3/2 pf
Output ........................................ 1.9 pf
Grid to Plate ................................. 1.8 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 2.5 W
Grid No. 2 Dissipation ........................ 0.55 W

Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 1 Voltage ............................ -1 V
Amplification Factor .......................... 46
Plate Resistance (approx) ..................... 5400 Ω
Transconductance .............................. 8500 µ
Plate Current ................................. 13.5 mA

Pentode Class A Amplifier
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -2 V
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 6000 µ
Plate Current ................................. 12 mA
Grid No. 2 Current ............................ 4 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

Wed, 29 Mar 2023 00:33:34 -0700