NJ7P SQL Tube Database Query

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6BL8
Medium-MuTriode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6LN8
Substitutes ................................... 6AX8 6U8 6KE8 6MG8
Source ........................................ RCA RC-29 - 1975
5124

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in frequency-shanger service in color and black-and-white television receivers. 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 ................................... 6-2
EIA Base ...................................... 9DC
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Heater Negative with Respect to Cathode
DC Component ............................ 100 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 5.5 pf
Output ........................................ 3.8 pf
Grid to Plate ................................. 0.025 pf

Triode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.5 pf
Output ........................................ 1.8 pf
Grid to Plate ................................. 1.5 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 175 V
Plate Dissipation ............................. 1.7 W
Grid No. 2 Dissipation ........................ 0.5 W
Cathode Current ............................... 14 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.5M Ω
Self Bias .................................. 1M Ω

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Plate Dissipation ............................. 1.5 W
Cathode Current ............................... 14 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.5M Ω
Self Bias .................................. 0.5M Ω

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 20
Transconductance .............................. 5000 µ
Plate Current ................................. 14 mA

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 170 V
Grid No. 2 Voltage ............................ 170 V
Grid No. 1 Voltage ............................ -2 V
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 6200 µ
Plate Current ................................. 10 mA
Grid No. 2 Current ............................ 2.8 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) 1994-2015 by William A. Beech, NJ7P

Thu, 21 Feb 2019 15:00:32 -0700