NJ7P SQL Tube Database Query

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6BM8
High-Mu Triode - Power Pentode

EIA Base & Outline

EIA Base: 9EXEIA Bulb: 6-4

Substitute Data

Substitutes ................................... 6HC8
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in color and black-and-white television receiver applications. The pentode unit is used as an audio output tube, and the triode unit as an oscillator and af voltage amplifier. Requires miniature 9-contact socket.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-4
EIA Base ...................................... 9EX
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.78 A
Maximum Heater-Cathode Voltage ................ 100 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 9.3 pf
Output ........................................ 8.0 pf
Grid to Plate ................................. 0.3 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.7 pf
Output ........................................ 4.0 pf
Grid to Plate ................................. 4.0 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 7 W
Grid No. 2 Dissipation ........................ 1.8 W
Cathode Current ............................... 50 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 1M Ω
Self Bias .................................. 2M Ω

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 1 W
Cathode Current ............................... 15 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 1M Ω
Self Bias .................................. 2M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ 0 V
Amplification Factor .......................... 70
Transconductance .............................. 2500 µMho
Plate Current ................................. 3.5 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -16 V
Peak Grid No. 1 Voltage........................ 6.6 V
Amplification Factor .......................... 9.5
Plate Resistance (approx) ..................... 20K Ω
Transconductance .............................. 6400 µMho
Plate Current ................................. 35 mA
Grid No. 2 Current ............................ 7 mA
Load Resistance ............................... 5.6K Ω
Power Output (approx) ......................... 3.5 W
Total Harmonic Distortion ..................... 10 %

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Tue, 24 May 2022 00:55:56 -0700