NJ7P SQL Tube Database Query

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6BC8
Medium-Mu Twin-Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BQ7 6BZ8 6BZ7
Substitutes ................................... 6AQ8 6BK7 6CG7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as a cascode amplifier in vhf television tuners and in push-pull cathode-drive rf amplifiers. 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 ...................................... 9AJ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.4 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V
Heater Negative with Respect to Cathode
DC Component ............................ 100 V
Total DC and Peak ....................... 200 V

Direct Interelectrode Capacitances (approx)

Triode 1 Cascode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 2.6 pf
Output ........................................ 1.3 pf
Grid to Plate ................................. 1.2 pf

Triode 2 Cascode
Source ........................................ RCA RC-29 - 1975
Input ......................................... 5.5 pf
Output ........................................ 2.4 pf
Grid to Plate ................................. 1.2 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Plate Dissipation ............................. 2.2 W
Cathode Current ............................... 22 mA
Grid No. 1 Circuit Resistance
Self Bias .................................. 0.5M Ω

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 220 Ω
Amplification Factor .......................... 35
Plate Resistance (approx) ..................... 5300 Ω
Transconductance .............................. 6200 µ
Plate Current ................................. 10 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

Sat, 25 Mar 2023 19:52:59 -0700