NJ7P SQL Tube Database Query

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6BR8A
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 6FV8 6JN8
Substitutes ................................... 6BE8 6CL8 6FG7
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in color and black-and-white television receiver applications. Especially useful as combined triode oscillator and pentode mixer in vhf television tuners.

Source ........................................ RCA RC-29 - 1975
Requires miniature 9-contact socket. Except for basing arrangement and grid-1--to-plate capacitance of pentode unit, this is identical to 6U8A.

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Shielded Unshielded
Input ......................................... 4.6 4.6 pf
Output ........................................ 2.4 3.2 pf
Grid to Plate ................................. 0.02 0.01 pf

Triode
Source ........................................ RCA RC-29 - 1975
Shielded Unshielded
Input ......................................... 2.8 2.8 pf
Output ........................................ 1.5 2.0 pf
Grid to Plate ................................. 1.8 1.8 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Plate Dissipation ............................. 3.0 W
Grid No. 2 Dissipation ........................ 0.55 W

Triode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Pentode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -1.0 V
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 5200 µ
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 3.5 mA
Grid No. 1 Voltage for Ib ..................... 20 µa @ -9 V

Triode Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 1 Voltage ............................ -1.0 V
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 5000 Ω
Transconductance .............................. 8500 µ
Plate Current ................................. 13.5 mA
Grid No. 1 Voltage for Ib ..................... 20 µa @ -9 V

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(c) 1994-2021 by William A. Beech, NJ7P

Thu, 20 Jan 2022 15:21:31 -0700