NJ7P SQL Tube Database Query

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6BQ7A
Medium-Mu Twin Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6BC8 6BZ7
Substitutes ................................... 6BK7 6BZ8 6CH7 6CX7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used as a cascode amplifier in vhf color and black-and-white 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
Total DC and Peak ....................... 200 V

Direct Interelectrode Capacitances (approx)

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

Triode 2
Source ........................................ RCA RC-29 - 1975
Input ......................................... 5.0 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 1.2 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Plate Dissipation ............................. 2 W
Cathode Current ............................... 20 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 0.5M Ω
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 .......................... 38
Plate Resistance (approx) ..................... 5900 Ω
Transconductance .............................. 6400 µ
Plate Current ................................. 9 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -6.5 V

Push Pull GG Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -2 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Current ................................. 10 mA

Cascode Input Stage [TS]
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -1 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 10 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -14 V

Cascode Output Stage [TS]
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 115 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 500K Ω
Grid No. 1 Current ............................ 0 mA
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

Tue, 09 Aug 2022 05:57:33 -0700