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6J7
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 7REIA Bulb: 8-4

Substitute Data

Preferred Substitutes ......................... 6W7
Substitutes ................................... 6K7 6S7 6U7
Source ........................................ RCA RC-15 - 1947 & RC-13 1937

Application

Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Metal type used as biased detectors or high-gain audio amplifiers in radio receivers. Require octal socket and may be mounted in any position.

Mechanical Data

Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 7-Pin
EIA Outline ................................... 8-4
EIA Base ...................................... 7R
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 90 V
Heater Negative with Respect to Cathode
DC Component ............................ 90 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Input ......................................... 7 pf
Output ........................................ 12 pf
Grid to Plate ................................. 0.005 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 300 V
Grid No. 2 Supply Voltage ..................... 300 V
Grid No. 2 Voltage ............................ 125 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 0.75 W
Grid No. 2 Dissipation ........................ 0.1 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1185
Plate Resistance (approx) ..................... 1.0M Ω
Transconductance .............................. 1185 µMho
Plate Current ................................. 2.0 mA
Grid No. 2 Current ............................ 0.5 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -7 V

Class A Amplifier
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1500
Plate Resistance (approx) ..................... >1.0M Ω
Transconductance .............................. 1225 µMho
Plate Current ................................. 2.0 mA
Grid No. 2 Current ............................ 0.7 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -7 V

Class A Amplifier (Triode Connected)
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -8 V
Plate Resistance (approx) ..................... 10500 Ω
Transconductance .............................. 1900 µMho
Plate Current ................................. 6.5 mA

Class A Amplifier (Triode Connected)
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -5.3 V
Plate Resistance (approx) ..................... 11000 Ω
Transconductance .............................. 1800 µMho
Plate Current ................................. 5.3 mA

Biased Detector
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 12 V
Grid No. 1 Voltage ............................ -1.16 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 18K Ω
Peak Grid No. 1 Voltage........................ 1.05 V
Grid No. 2 Current ............................ 0.63 mA
Load Resistance ............................... 500K Ω

Biased Detector
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 30 V
Grid No. 1 Voltage ............................ -1.83 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 10K Ω
Peak Grid No. 1 Voltage........................ 1.6 V
Grid No. 2 Current ............................ 0.183 mA
Load Resistance ............................... 500K Ω

Biased Detector
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 50 V
Grid No. 1 Voltage ............................ -2.0 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 3K Ω
Peak Grid No. 1 Voltage........................ 1.18 V
Grid No. 2 Current ............................ 0.65 mA
Load Resistance ............................... 500K Ω

Biased Detector
Source ........................................ RCA RC-15 - 1947 & RC-13 1937
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -4.3 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 10K Ω
Peak Grid No. 1 Voltage........................ 1.37 V
Grid No. 2 Current ............................ 0.43 mA
Load Resistance ............................... 500K Ω

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Thu, 18 Aug 2022 00:53:18 -0700