NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

6CM8
High-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9FZEIA Bulb: 6-2
Source ........................................ Sylvania

Application

Source ........................................ Sylvania
Miniature type used in tv receivers. The pentode is used as an if amplifier, video amplifier, agc amplifier or reactance tube. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ Sylvania
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9FZ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ Sylvania
Input ......................................... 6 pf
Output ........................................ 2.6 pf
Grid to Plate ................................. 0.02 pf

Triode
Source ........................................ Sylvania
Input ......................................... 1.6 pf
Output ........................................ 0.22 pf
Grid to Plate ................................. 1.9 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ Sylvania
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 2.0 W
Grid No. 2 Dissipation ........................ 0.5 W

Triode
Source ........................................ Sylvania
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 1.0 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ Sylvania
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 50K Ω
Transconductance .............................. 2000 µMho
Plate Current ................................. 1.8 mA

Pentode Class A Amplifier
Source ........................................ Sylvania
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 6200 µMho
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 2.8 mA

A horizontal ribbon.

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A horizontal ribbon.

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Thu, 30 Jun 2022 05:52:25 -0700