Eimac Power Grid Tube Reference Data

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4CX250B/7203

The 4CX250B/7203 has a maximum plate dissipation rating of 250 watts and a maximum input power rating of 500 watts. The 4CX250B/7203 is designed to operate with a heater voltage of 6.0 volts.

Characteristics

Plate Dissipation (Max.)	250 Watts
Screen Dissipation (Max.)	12 Watts
Grid Dissipation (Max.)	2 Watts
Frequency for Max. rating (CW)	500 MHz
Amplification Factor	5
Filament/Cathode	Oxide Coated
Voltage Current	6.0 Volts 2.6 Amps
Capacitance	Grounded Cathode
Input Output Feedthrough	15.7 pf 4.5 pf .04 pf
Capacitance	Grounded Grid
Input Output Feedthrough	13.0 pf 4.5 pf .01 pf
Cooling	Forced Air
Base	9 Pin Special
Air Socket	SK-600A
Air Chimney	SK-606
Boiler	---
Length	2.46 in; 62.50 mm
Diameter	1.64 in; 41.70 mm
Weight	4 oz; 113 gm

		Maximum Ratings		Typical Operation
Class of Operation	Type of Service	Plate Voltage (Volts)	Plate current (Amps)	Plate Voltage (Volts)	Screen Voltage (Volts)	Plate Current (Amps)	Drive Power (Watts)	Output Power (kiloWatts)
C	RF Amplifier up to 175 MHz	2,000	0.25	2,000	300	.025	2.9	0.390
C	RF Amplifier Plate Modulated up to 175 MHz	1,500	0.20	1,500	250	0.20	1.7	0.235
AB1	RF Linear Amplifier up to 175 MHz	2,000	0.25	2,000	350	0.25	---	0.300
AB1	RF Linear Amplifier(AM Service) up to 175 MHz	2,000	0.25	2,000	350	0.15	---	0.65
AB1	Af Amlifier or Modulator	2,000	0.25	2,000	350	0.50	---	0.600

Characteristics and Operating values are based on performance tests. Figures may change without notice as the result of additional data or product refinement. CPI Eimac Division should be consulted before using this information for final equipment design.