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4X250F Transmitting Tube, EIMAC (NOS)


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4X250F Transmitting Tube, Ceramic, Filament 26.5v NOS , MFR: Eimac *USA*



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4X250F Transmitting Tube, Ceramic, Filament 26.5v NOS *USA*

The 4X250F is a compact, oxide-cathode, external-anode power triode, unilaterally interchangeable with the 4X150D in most applications, and is intended for use as an amplifier, oscillator or frequency multiplier over a wide range of frequencies extending into the UHF region.  It is cooled by convection and forced air.

A single 4x250F is a coaxial-cavity amplifier circuit will deliver up to 300 watts of useful power output at 400 megacycles although this is not the upper frequency limit of the tube.  Outstanding features of the 4X250F are:

  1. Simple air-cooling requirements.
  2. A maximum plate dissipation ration of 250 watts available for low-efficiency applications.
  3. A maximum plate voltage rating of 2000 volts at frequencies up to 400 MHz.  The high transconductance of the 4X250F makes the tube useful at relatively low plate voltages.  The high ration of transconductance to inter-electrode capacitance and the 250 watt plate dissipation make the tube very useful for wide-band amplifier applications.

4X250F although electrically equivalent to the 4CX250B, the base seals must be kept below 175 deg C, whereas on the 4CX250B they are okay to 250 deg C.

MFR: Eimac

Limited Quantity Available, New Old Stock.

NOTE: Picture for reference only.  Production date and Cosmetic condition may vary.

Made in the USA

Additional Information

Featured Product N/A
Made in the USA Yes
Manufacturer Eimac

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