NJ7P SQL Tube Database Query

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6BC5
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 7BDEIA Bulb: 5-2

Substitute Data

Preferred Substitutes ......................... 6AG5 6186
Substitutes ................................... 6CE5 6AH6 6AU6 6HS6
Source ........................................ RCA RC-29 - 1975

Application

Source ........................................ RCA RC-29 - 1975
Miniature type used in compact radio equipment as an rf or if amplifier at frequencies up to 400 MHz. Requires miniature 7-contact socket. Triode connection connects grid 2 to plate.

Mechanical Data

Source ........................................ RCA RC-29 - 1975
Bulb .......................................... T-5 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 5-2
EIA Base ...................................... 7BD
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-29 - 1975
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-29 - 1975
Shielded Unshielded
Input ......................................... 6.5 6.6 pf
Output ........................................ 1.8 2.6 pf
Grid to Plate ................................. 0.03 0.02 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2 W
Grid No. 2 Dissipation ........................ 0.5 W

Triode Connected
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 300 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2.5 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 800K Ω
Transconductance .............................. 5700 µMho
Plate Current ................................. 7.5 mA
Grid No. 2 Current ............................ 2.1 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -8 V

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 125 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 100 Ω
Plate Resistance (approx) ..................... 500K Ω
Transconductance .............................. 6100 µMho
Plate Current ................................. 8 mA
Grid No. 2 Current ............................ 2.4 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -6 V

Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 180 Ω
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 4900 µMho
Plate Current ................................. 4.7 mA
Grid No. 2 Current ............................ 1.4 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -5 V

Tri Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 820 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 9000 Ω
Transconductance .............................. 4400 µMho
Plate Current ................................. 6 mA

Tri Class A Amplifier
Source ........................................ RCA RC-29 - 1975
Plate Voltage ................................. 180 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 330 Ω
Amplification Factor .......................... 42
Plate Resistance (approx) ..................... 6000 Ω
Transconductance .............................. 6000 µMho
Plate Current ................................. 8 mA

Notes

Source ........................................ RCA RC-29 - 1975
1. Grid 2 connected to plate for triode connection.

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Thu, 29 Sep 2022 00:11:56 -0700