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6K7
Variable-Mu Pentode

EIA Base & Outline

EIA Base: 7REIA Bulb: 8-4

Substitute Data

Preferred Substitutes ......................... 6S7
Substitutes ................................... 6J7 6U7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Metal type used in rf and if stages of radio receivers, particularly in those employing avc. Require octal socket and may be mounted in any position. Similar to type 78.

Mechanical Data

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

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A
Maximum Heater-Cathode Voltage ................ 90 V

Direct Interelectrode Capacitances (approx)

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

Maximum Ratings (Design Center Values)

Pentode [RC-13]
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Positive Grid No. 1 Voltage ................... 0 V

Pentode
Source ........................................ RCA RC-15 - 1947
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 ............................. 2.75 W
Grid No. 2 Dissipation ........................ 0.35 W

Characteristics and Typical Operation

Class A Amplifier [RC-13]
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 400
Plate Resistance (approx) ..................... 315K Ω
Transconductance .............................. 1275 µMho
Plate Current ................................. 5.4 mA
Grid No. 2 Current ............................ 1.3 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -38.5 V

Class A Amplifier [RC-13]
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 75 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1100
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 1100 µMho
Plate Current ................................. 4.0 mA
Grid No. 2 Current ............................ 1.0 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -32.5 V

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 1650 µMho
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 2.7 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1160
Plate Resistance (approx) ..................... 800K Ω
Transconductance .............................. 1450 µMho
Plate Current ................................. 7.0 mA
Grid No. 2 Current ............................ 1.7 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -42.5 V

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 990
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 1650 µMho
Plate Current ................................. 10.5 mA
Grid No. 2 Current ............................ 2.6 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -52.5 V

Mixer [RC-13]
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -10 V

Notes

Source ........................................ RCA RC-15 - 1947
1. Oscillator injection is 7 volts peak to peak.

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Thu, 30 Jun 2022 04:12:54 -0700