RF Power Grid Tubes · Tetrodes

4CX250B — 4CX250B Ceramic Tetrode

Manufacturer: Eimac / CPI

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Product Description

Classic ceramic-metal beam tetrode with 250 W plate dissipation, widely used in HF and VHF amplifiers up to 110 MHz.

Technical Specifications

Tube Type	Beam Tetrode
Plate Dissipation	250 W
Max Plate Voltage	3.5 kV
Max Plate Current	175 mA
Screen Voltage	300 V
Transconductance	25 mA/V
Max Frequency	110 MHz
Filament Voltage	6.0 V
Filament Current	2.5 A
Envelope	Ceramic-metal

Applications

HF linear amplifiers
VHF broadcast transmitters
Industrial RF heating
Amateur radio amplifiers
Military HF communications

Key Features

Industry-standard 250 W ceramic tetrode
Proven 60-year design heritage
110 MHz max frequency
Water-cooled anode option
Socket-compatible with 4CX250R