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6146
Beam Power Pentode

EIA Base & Outline

EIA Base: 7CKEIA Bulb: 12-33

Substitute Data

Preferred Substitutes ......................... 6146A 6146B 8298 8298A
Source ........................................ RCA DS 05/52

Application

Small, sturdy, glass-octal heater cathode type used as af power amplifier and modulator and as rf power amplifer and oscillator.

May be used with full input up to 60 MHz and with reduced input up to 175 MHz. Class C telegraphy maximum plate dissipation, CCS 20 Wattts, ICAS 25 Watts.

Mechanical Data

Bulb .......................................... T-12
Base Type ..................................... Large Wafer Octal 8-Pin
EIA Outline ................................... 12-33
Maximum Overall Height ........................ 3-13/16 In.
Maximum Seated Height ......................... 3-1/4 In.
EIA Base ...................................... 7CK
Top Cap ....................................... Small C1-1
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.25 A
Maximum Heater-Cathode Voltage ................ 135 V

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 13.5 pf
Output ........................................ 8.5 pf
Grid to Plate ................................. 0.22 pf

Maximum Ratings (Design Center Values)

Plate-Modulated RF Power Amplifier - Class C (CCS)
Plate Voltage ................................. 480 V
Grid No. 2 Voltage ............................ 250 V
Negative Grid No. 1 Voltage ................... -150 V
Plate Input ................................... 45 W
Plate Dissipation ............................. 13.3 W
Grid No. 2 Dissipation ........................ 2 W
Plate Current ................................. 117 mA
Grid Current .................................. 3.5 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

Plate-Modulated RF Power Amplifier - Class C (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 250 V
Negative Grid No. 1 Voltage ................... -150 V
Plate Input ................................... 67.5 W
Plate Dissipation ............................. 16.7 W
Grid No. 2 Dissipation ........................ 2 W
Plate Current ................................. 125 mA
Grid Current .................................. 4.0 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

AF Power Amplifier & Modulator - Class AB1 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 60 W
Plate Dissipation ............................. 20 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 125 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 100K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

AF Power Amplifier & Modulator - Class AB1 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 85 W
Plate Dissipation ............................. 25 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 135 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 100K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

AF Power Amplifier & Modulator - Class AB2 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 62.5 W
Plate Dissipation ............................. 20 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 125 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

AF Power Amplifier & Modulator - Class AB2 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 90 W
Plate Dissipation ............................. 25 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 135 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

RF Power Amplifier & Oscillator - Class C (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 250 V
Negative Grid No. 1 Voltage ................... -150 V
Plate Input ................................... 67.5 W
Plate Dissipation ............................. 20 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 140 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

RF Power Amplifier & Oscillator - Class C (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 250 V
Negative Grid No. 1 Voltage ................... -150 V
Plate Input ................................... 90 W
Plate Dissipation ............................. 25 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 150 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

Linear RF Power Amplifier - Class AB1 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 60 W
Plate Dissipation ............................. 20 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 125 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

Linear RF Power Amplifier - Class AB1 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 250 V
Plate Input ................................... 85 W
Plate Dissipation ............................. 25 W
Grid No. 2 Dissipation ........................ 3 W
Plate Current ................................. 135 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 30K Ω
Bulb Temperature (At Hottest Point) ........... 220 °C

Characteristics and Typical Operation

Plate Modulated RF Power Amplifier - Class C (CCS)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 2 Dropping Resistor .................. 21500 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 112 mA
Grid No. 2 Current ............................ 11.6 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 34 W

Plate Modulated RF Power Amplifier - Class C (CCS)
Plate Voltage ................................. 475 V
Grid No. 2 Voltage ............................ 135 V
Grid No. 2 Dropping Resistor .................. 26500 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Peak Grid No. 1 Voltage........................ 99 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 94 mA
Grid No. 2 Current ............................ 12.8 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 33 W

Plate Modulated RF Power Amplifier - Class C (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 2 Dropping Resistor .................. 37500 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 113 mA
Grid No. 2 Current ............................ 12 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 52 W

Push Pull AF Power Amplifier & Modulator - Class AB1 (CCS)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 190 V
Grid No. 1 Voltage ............................ -40 V
Peak Grid No. 1 Voltage........................ 80 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 86 mA
Plate Current (Maximum Signal) ................ 228 mA
Grid No. 2 Current (Zero Signal) .............. 2 mA
Grid No. 2 Current (Maximum Signal) ........... 30 mA
Driving Power ................................. 0 W
Load Resistance ............................... 4K Ω
Power Output (approx) ......................... 55 W
Total Harmonic Distortion ..................... 8 %

Push Pull AF Power Amplifier & Modulator - Class AB1 (CCS)
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -40 V
Peak Grid No. 1 Voltage........................ 80 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 70 mA
Plate Current (Maximum Signal) ................ 220 mA
Grid No. 2 Current (Zero Signal) .............. 1.4 mA
Grid No. 2 Current (Maximum Signal) ........... 19.5 mA
Driving Power ................................. 0 W
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 70 W
Total Harmonic Distortion ..................... 8 %

Push Pull AF Power Amplifier & Modulator - Class AB1 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 190 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 90 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 60 mA
Plate Current (Maximum Signal) ................ 200 mA
Grid No. 2 Current (Zero Signal) .............. 1 mA
Grid No. 2 Current (Maximum Signal) ........... 30.5 mA
Driving Power ................................. 0 W
Load Resistance ............................... 7.5K Ω
Power Output (approx) ......................... 82 W
Total Harmonic Distortion ..................... 8 %

Push Pull AF Power Amplifier & Modulator - Class AB1 (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 52 mA
Plate Current (Maximum Signal) ................ 239 mA
Grid No. 2 Current (Zero Signal) .............. 1.2 mA
Grid No. 2 Current (Maximum Signal) ........... 25.2 mA
Driving Power ................................. 0 W
Load Resistance ............................... 5.5K Ω
Power Output (approx) ......................... 94 W
Total Harmonic Distortion ..................... 7.5 %

Push Pull AF Power Amplifier & Modulator - Class AB1 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 57 mA
Plate Current (Maximum Signal) ................ 227 mA
Grid No. 2 Current (Zero Signal) .............. 1 mA
Grid No. 2 Current (Maximum Signal) ........... 27.5 mA
Driving Power ................................. 0 W
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 120 W
Total Harmonic Distortion ..................... 5.7 %

Push Pull AF Power Amplifier & Modulator - Class AB2 (CCS)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 175 V
Grid No. 1 Voltage ............................ -40 V
Peak Grid No. 1 Voltage........................ 86 V
Grid No. 1 Current ............................ 0.3 mA
Plate Current (Zero Signal) ................... 63 mA
Plate Current (Maximum Signal) ................ 232 mA
Grid No. 2 Current (Zero Signal) .............. 1.5 mA
Grid No. 2 Current (Maximum Signal) ........... 28 mA
Driving Power ................................. 0.01 W
Load Resistance ............................... 4K Ω
Power Output (approx) ......................... 60 W
Total Harmonic Distortion ..................... 9.7 %

Push Pull AF Power Amplifier & Modulator - Class AB2 (CCS)
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 175 V
Grid No. 1 Voltage ............................ -40 V
Peak Grid No. 1 Voltage........................ 87 V
Grid No. 1 Current ............................ 0.3 mA
Plate Current (Zero Signal) ................... 64 mA
Plate Current (Maximum Signal) ................ 242 mA
Grid No. 2 Current (Zero Signal) .............. 1.2 mA
Grid No. 2 Current (Maximum Signal) ........... 26 mA
Driving Power ................................. 0.01 W
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 81 W
Total Harmonic Distortion ..................... 9.7 %

Push Pull AF Power Amplifier & Modulator - Class AB2 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 165 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 99 V
Grid No. 1 Current ............................ 0.5 mA
Plate Current (Zero Signal) ................... 31 mA
Plate Current (Maximum Signal) ................ 207 mA
Grid No. 2 Current (Zero Signal) .............. 0.7 mA
Grid No. 2 Current (Maximum Signal) ........... 31 mA
Driving Power ................................. 0.02 W
Load Resistance ............................... 7.5K Ω
Power Output (approx) ......................... 90 W
Total Harmonic Distortion ..................... 9.7 %

Push Pull AF Power Amplifier & Modulator - Class AB2 (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 185 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 113 V
Grid No. 1 Current ............................ 0.8 mA
Plate Current (Zero Signal) ................... 41 mA
Plate Current (Maximum Signal) ................ 270 mA
Grid No. 2 Current (Zero Signal) .............. 0.9 mA
Grid No. 2 Current (Maximum Signal) ........... 29 mA
Driving Power ................................. 0.04 W
Load Resistance ............................... 5.5K Ω
Power Output (approx) ......................... 115 W
Total Harmonic Distortion ..................... 11 %

Push Pull AF Power Amplifier & Modulator - Class AB2 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 165 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 101 V
Grid No. 1 Current ............................ 0.7 mA
Plate Current (Zero Signal) ................... 35 mA
Plate Current (Maximum Signal) ................ 240 mA
Grid No. 2 Current (Zero Signal) .............. 0.6 mA
Grid No. 2 Current (Maximum Signal) ........... 21 mA
Driving Power ................................. 0.03 W
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 130 W
Total Harmonic Distortion ..................... 10 %

RF Power Amplifier & Oscillator - Class C (CCS)
Plate Voltage ................................. 500 V
Grid No. 2 Voltage ............................ 170 V
Grid No. 2 Dropping Resistor .................. 29200 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Cathode Bias Resistor ...................... 570 Ω
Peak Grid No. 1 Voltage........................ 99 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 135 mA
Grid No. 2 Current ............................ 11.3 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 50 W
Maximum Frequency ............................. 60 MHz

RF Power Amplifier & Oscillator - Class C (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 2 Dropping Resistor .................. 40200 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Cathode Bias Resistor ...................... 670 Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 113 mA
Grid No. 2 Current ............................ 11.2 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 52 W
Maximum Frequency ............................. 60 MHz

RF Power Amplifier & Oscillator - Class C (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 2 Dropping Resistor .................. 28000 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Cathode Bias Resistor ...................... 510 Ω
Peak Grid No. 1 Voltage........................ 102 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 15 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 69 W
Maximum Frequency ............................. 60 MHz

RF Power Amplifier & Oscillator - Class C (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 160 V
Grid No. 2 Dropping Resistor .................. 40100 Ω
Grid No. 1 Voltage ............................ -85 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 28300 Ω
Cathode Bias Resistor ...................... 620 Ω
Peak Grid No. 1 Voltage........................ 100 V
Grid No. 1 Current ............................ 3.0 mA
Plate Current ................................. 120 mA
Grid No. 2 Current ............................ 14.7 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 69 W
Maximum Frequency ............................. 60 MHz

RF Power Amplifier & Oscillator - Class C at 175 MHz (CCS)
Plate Voltage ................................. 320 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 2 Dropping Resistor .................. 15500 Ω
Grid No. 1 Voltage ............................ -54 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 30000 Ω
Cathode Bias Resistor ...................... 360 Ω
Peak Grid No. 1 Voltage........................ 70 V
Grid No. 1 Current ............................ 1.8 mA
Plate Current ................................. 140 mA
Grid No. 2 Current ............................ 9.0 mA
Driving Power ................................. 2.0 W
Power Output (approx) ......................... 25 W
Maximum Frequency ............................. 175 MHz

RF Power Amplifier & Oscillator - Class C at 175 MHz (ICAS)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 2 Dropping Resistor .................. 22200 Ω
Grid No. 1 Voltage ............................ -54 V
Grid No. 1 Voltage Derived from
Grid No. 1 Resistor ........................ 30000 Ω
Cathode Bias Resistor ...................... 335 Ω
Peak Grid No. 1 Voltage........................ 70 V
Grid No. 1 Current ............................ 1.8 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 9.0 mA
Driving Power ................................. 3.0 W
Power Output (approx) ......................... 35 W
Maximum Frequency ............................. 175 MHz

Linear RF Power Amplifier - Class AB1 (CCS)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 190 V
Grid No. 1 Voltage ............................ -40 V
Peak Grid No. 1 Voltage........................ 40 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 114 mA
Grid No. 2 Current ............................ 12 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 27 W
Maximum Frequency ............................. 60 MHz

Linear RF Power Amplifier - Class AB1 (CCS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 45 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 100 mA
Grid No. 2 Current ............................ 11 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 41 W
Maximum Frequency ............................. 60 MHz

Linear RF Power Amplifier - Class AB1 (ICAS)
Plate Voltage ................................. 600 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 50 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 115 mA
Grid No. 2 Current ............................ 14 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 48 W
Maximum Frequency ............................. 60 MHz

Linear RF Power Amplifier - Class AB1 (ICAS)
Plate Voltage ................................. 750 V
Grid No. 2 Voltage ............................ 195 V
Grid No. 1 Voltage ............................ -50 V
Peak Grid No. 1 Voltage........................ 50 V
Grid No. 1 Current ............................ 0 mA
Plate Current ................................. 110 mA
Grid No. 2 Current ............................ 13 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 60 W
Maximum Frequency ............................. 60 MHz

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Tue, 16 Aug 2022 08:41:06 -0700