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4-250A
Radial Beam Power Tetrode

EIA Base & Outline

EIA Base: 5BK
Source ........................................ Eimac DS 7/55

Mechanical Data

Source ........................................ Eimac DS 7/55
Base Type ..................................... 5-Pin Metal Shell
Maximum Overall Height ........................ 6-1/8 In.
Maximum Seated Height ......................... 5-3/8 In.
Maximum Diameter .............................. 4 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 7/55
Filament Voltage .............................. 5 V
Filament Current .............................. 14.5 A

Direct Interelectrode Capacitances (approx)

Tetrode [CCS]
Source ........................................ Eimac DS 7/55
Input ......................................... 12.7 pf
Output ........................................ 4.5 pf
Grid to Plate ................................. 0.12 pf

Maximum Ratings (Design Center Values)

Tetrode (Class C Amplifier/Oscillator) [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 600 V
Negative Grid No. 1 Voltage ................... -500 V
Plate Dissipation ............................. 250 W
Grid No. 2 Dissipation ........................ 35 W
Plate Current ................................. 350 mA
Bulb Temperature (At Hottest Point) ........... 170 °C

Tetrode (Plate Modulated Class C Amplifier) [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 3200 V
Grid No. 2 Voltage ............................ 600 V
Negative Grid No. 1 Voltage ................... -500 V
Plate Dissipation ............................. 165 W
Grid No. 2 Dissipation ........................ 35 W
Plate Current ................................. 275 mA
Bulb Temperature (At Hottest Point) ........... 170 °C

Tetrode (Class AB1 or AB2 Amplifier) [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 600 V
Plate Dissipation ............................. 250 W
Grid No. 2 Dissipation ........................ 35 W
Plate Current ................................. 350 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 7/55
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 500 V
Grid No. 1 Voltage ............................ -150 V
Peak Grid No. 1 Voltage........................ 220 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 300 mA
Grid No. 2 Current ............................ 60 mA
Driving Power ................................. 1.7 W
Power Output (approx) ......................... 575 W
Maximum Frequency ............................. 110 MHz

Class C Oscillator/Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 500 V
Grid No. 1 Voltage ............................ -180 V
Peak Grid No. 1 Voltage........................ 265 V
Grid No. 1 Current ............................ 10 mA
Plate Current ................................. 345 mA
Grid No. 2 Current ............................ 60 mA
Driving Power ................................. 2.6 W
Power Output (approx) ......................... 800 W
Maximum Frequency ............................. 110 MHz

Class C Oscillator/Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 500 V
Grid No. 1 Voltage ............................ -225 V
Peak Grid No. 1 Voltage........................ 303 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 312 mA
Grid No. 2 Current ............................ 45 mA
Driving Power ................................. 2.46 W
Power Output (approx) ......................... 1000 W
Maximum Frequency ............................. 110 MHz

Plate Modulated Class C Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -200 V
Peak Grid No. 1 Voltage........................ 225 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 200 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 2.2 W
Power Output (approx) ......................... 375 W
Maximum Frequency ............................. 110 MHz

Plate Modulated Class C Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 400 V
Grid No. 1 Voltage ............................ -310 V
Peak Grid No. 1 Voltage........................ 365 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 225 mA
Grid No. 2 Current ............................ 30 mA
Driving Power ................................. 3.2 W
Power Output (approx) ......................... 510 W
Maximum Frequency ............................. 110 MHz

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 1500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -95 V
Peak Grid No. 1 Voltage........................ 128 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 400 mA
Grid No. 2 Current (Zero Signal) .............. -0.4 mA
Grid No. 2 Current (Maximum Signal) ........... 23 mA
Driving Power ................................. 0 W
Load Resistance ............................... 6250 Ω
Power Output (approx) ......................... 310 W

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -104 V
Peak Grid No. 1 Voltage........................ 176 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 110 mA
Plate Current (Maximum Signal) ................ 405 mA
Grid No. 2 Current (Zero Signal) .............. -0.3 mA
Grid No. 2 Current (Maximum Signal) ........... 22 mA
Driving Power ................................. 0 W
Load Resistance ............................... 9170 Ω
Power Output (approx) ......................... 460 W

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -110 V
Peak Grid No. 1 Voltage........................ 180 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 430 mA
Grid No. 2 Current (Zero Signal) .............. -0.3 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Driving Power ................................. 0 W
Load Resistance ............................... 11400 Ω
Power Output (approx) ......................... 625 W

Push Pull Class AB1 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -116 V
Peak Grid No. 1 Voltage........................ 186 V
Grid No. 1 Current ............................ 0 mA
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 417 mA
Grid No. 2 Current (Zero Signal) .............. -0.2 mA
Grid No. 2 Current (Maximum Signal) ........... 10.5 mA
Driving Power ................................. 0 W
Load Resistance ............................... 15K Ω
Power Output (approx) ......................... 750 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 1500 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -48 V
Peak Grid No. 1 Voltage........................ 96 V
Plate Current (Zero Signal) ................... 100 mA
Plate Current (Maximum Signal) ................ 485 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 34 mA
Driving Power ................................. 2.1 W
Load Resistance ............................... 5400 Ω
Power Output (approx) ......................... 214 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -48 V
Peak Grid No. 1 Voltage........................ 99 V
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 510 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 26 mA
Driving Power ................................. 2.3 W
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 325 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -51 V
Peak Grid No. 1 Voltage........................ 100 V
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 500 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 23 mA
Driving Power ................................. 2.2 W
Load Resistance ............................... 10.9K Ω
Power Output (approx) ......................... 420 W

Push Pull Class AB2 Amplifier [CCS]
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 3000 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -53 V
Peak Grid No. 1 Voltage........................ 99 V
Plate Current (Zero Signal) ................... 125 mA
Plate Current (Maximum Signal) ................ 473 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 33 mA
Driving Power ................................. 1.9 W
Load Resistance ............................... 16K Ω
Power Output (approx) ......................... 520 W

Class AB1 Amplifier
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 4000 V
Grid No. 2 Voltage ............................ 510 V
Grid No. 1 Voltage ............................ -100 V
Peak Grid No. 1 Voltage........................ 100 V
Plate Current (Zero Signal) ................... 40 mA
Plate Current (Maximum Signal) ................ 165 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 7.5 mA
Driving Power ................................. 0 W
Power Output (approx) ......................... 450 W

Push Pull Class AB2 Amplifier
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2000 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -48 V
Peak Grid No. 1 Voltage........................ 198 V
Plate Current ................................. 510 mA
Grid No. 2 Current (Zero Signal) .............. 0 mA
Grid No. 2 Current (Maximum Signal) ........... 26 mA
Driving Power ................................. 5.5 W
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 650 W

Push Pull Class AB1 Amplifier
Source ........................................ Eimac DS 7/55
Plate Voltage ................................. 2500 V
Grid No. 2 Voltage ............................ 600 V
Grid No. 1 Voltage ............................ -110 V
Peak Grid No. 1 Voltage........................ 180 V
Plate Current ................................. 430 mA
Grid No. 2 Current (Zero Signal) .............. 0.3 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Driving Power ................................. 0 W
Load Resistance ............................... 11.4K Ω
Power Output (approx) ......................... 625 W

Notes

Source ........................................ Eimac DS 7/55
1. Screen requires 350 Vpp AF for 100% plate modulation.

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Tue, 16 Aug 2022 00:18:19 -0700