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4-125A
Radial Beam Power Tetrode

EIA Base & Outline

EIA Base: 5BK
Source ........................................ Eimac DS 6/67

Mechanical Data

Source ........................................ Eimac DS 6/67
Base Type ..................................... 5-Pin Metal Shell
Maximum Overall Height ........................ 5-7/16 In.
Maximum Seated Height ......................... 4-11/16 In.
Maximum Diameter .............................. 2-13/16 In.
EIA Base ...................................... 5BK
Top Cap ....................................... Skirted Small C1-22
Cathode ....................................... Thoriated Tungsten
Mounting Position ............................. Vertical Base Up or Down

Electrical Data

Source ........................................ Eimac DS 6/67
Filament Voltage .............................. 5 V
Filament Current .............................. 6.5 A

Direct Interelectrode Capacitances (approx)

Tetrode [CCS]
Source ........................................ Eimac DS 6/67
Input ......................................... 10.8 pf
Output ........................................ 3.1 pf
Grid to Plate ................................. 0.05 pf

Maximum Ratings (Design Center Values)

Tetrode (Class C Amplifier) [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 400 V
Negative Grid No. 1 Voltage ................... -500 V
Plate Dissipation ............................. 125 W
Grid No. 2 Dissipation ........................ 20 W
Plate Current ................................. 225 mA
Bulb Temperature (At Hottest Point) ........... 170 °C

Tetrode (Plate Modulated Class C Amplifier) [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 400 V
Negative Grid No. 1 Voltage ................... -500 V
Plate Dissipation ............................. 85 W
Grid No. 2 Dissipation ........................ 20 W
Plate Current ................................. 200 mA
Bulb Temperature (At Hottest Point) ........... 170 °C

Tetrode (Class AB1 Amplifier) [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 600 V
Plate Dissipation ............................. 125 W
Grid No. 2 Dissipation ........................ 20 W
Plate Current ................................. 225 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 250K Ω
Bulb Temperature (At Hottest Point) ........... 170 °C

Tetrode (Class AB2 Amplifier) [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 400 V
Plate Dissipation ............................. 125 W
Grid No. 2 Dissipation ........................ 20 W
Plate Current ................................. 225 mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. 250K Ω
Bulb Temperature (At Hottest Point) ........... 170 °C

Characteristics and Typical Operation

Class C Oscillator/Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -100 V
Peak Grid No. 1 Voltage........................ 230 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 200 mA
Grid No. 2 Current ............................ 50 mA
Driving Power ................................. 2.8 W
Power Output (approx) ......................... 275 W
Maximum Frequency ............................. 120 MHz

Class C Oscillator/Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -150 V
Peak Grid No. 1 Voltage........................ 320 V
Grid No. 1 Current ............................ 12 mA
Plate Current ................................. 200 mA
Grid No. 2 Current ............................ 40 mA
Driving Power ................................. 3.8 W
Power Output (approx) ......................... 375 W
Maximum Frequency ............................. 120 MHz

Class C Oscillator/Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -150 V
Peak Grid No. 1 Voltage........................ 280 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 167 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 2.5 W
Power Output (approx) ......................... 375 W
Maximum Frequency ............................. 120 MHz

Plate Modulated Class C Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -220 V
Peak Grid No. 1 Voltage........................ 375 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 150 mA
Grid No. 2 Current ............................ 33 mA
Driving Power ................................. 3.8 W
Power Output (approx) ......................... 225 W
Maximum Frequency ............................. 120 MHz

Plate Modulated Class C Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -210 V
Peak Grid No. 1 Voltage........................ 360 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 152 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 3.3 W
Power Output (approx) ......................... 300 W
Maximum Frequency ............................. 120 MHz

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 1500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -90 V
Peak Grid No. 1 Voltage........................ 180 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 60 mA
Plate Current (Maximum Signal) ................ 222 mA
Grid No. 2 Current (Zero Signal) .............. -1.0 mA
Grid No. 2 Current (Maximum Signal) ........... 17 mA
Driving Power ................................. 0 W
Load Resistance ............................... 10.2K Ω
Power Output (approx) ......................... 158 W

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -94 V
Peak Grid No. 1 Voltage........................ 188 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 240 mA
Grid No. 2 Current (Zero Signal) .............. -0.5 mA
Grid No. 2 Current (Maximum Signal) ........... 6.4 mA
Driving Power ................................. 0 W
Load Resistance ............................... 13.4K Ω
Power Output (approx) ......................... 230 W

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -96 V
Peak Grid No. 1 Voltage........................ 192 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 232 mA
Grid No. 2 Current (Zero Signal) .............. -0.3 mA
Grid No. 2 Current (Maximum Signal) ........... 8.5 mA
Driving Power ................................. 0 W
Load Resistance ............................... 20.3K Ω
Power Output (approx) ......................... 330 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 1500 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -41 V
Peak Grid No. 1 Voltage........................ 282 V
Plate Current (Zero Signal) ................... 87 mA
Plate Current (Maximum Signal) ................ 400 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 34 mA
Driving Power ................................. 5.2 W
Load Resistance ............................... 7.2K Ω
Power Output (approx) ......................... 350 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -45 V
Peak Grid No. 1 Voltage........................ 210 V
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 300 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 5 mA
Driving Power ................................. 3.1 W
Load Resistance ............................... 13.6K Ω
Power Output (approx) ......................... 350 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -43 V
Peak Grid No. 1 Voltage........................ 178 V
Plate Current (Zero Signal) ................... 93 mA
Plate Current (Maximum Signal) ................ 260 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 6 mA
Driving Power ................................. 2.4 W
Load Resistance ............................... 22.2K Ω
Power Output (approx) ......................... 400 W

Push Pull Class AB2 Amplifier
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 350 V
Grid No. 1 Voltage ............................ -43 V
Peak Grid No. 1 Voltage........................ 178 V
Plate Current (Zero Signal) ................... 93 mA
Plate Current (Maximum Signal) ................ 260 mA
Grid No. 2 Current ............................ 0/6 mA
Driving Power ................................. 1.0 W
Load Resistance ............................... 22K Ω
Power Output (approx) ......................... 400 W

Push Pull Class AB1 Amplifier
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -96 V
Peak Grid No. 1 Voltage........................ 192 V
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 232 mA
Grid No. 2 Current (Zero Signal) .............. 0.3 mA
Grid No. 2 Current (Maximum Signal) ........... 8.5 mA

GG
Source ........................................ Eimac DS 6/67
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 0 V
Grid No. 1 Voltage ............................ 0 V
Grid No. 1 Current ............................ 55 mA
Plate Current (Zero Signal) ................... 10 mA
Plate Current (Maximum Signal) ................ 105 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 16 W
Load Resistance ............................... 10.5K Ω
Power Output (approx) ......................... 145 W

Notes

Source ........................................ Eimac DS 6/67
1. Screen requires 210 Vpp AF for 100% plate modulation.

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Thu, 18 Aug 2022 10:06:56 -0700