The 4CX35,000C is primarily designed for high power transmitter use at medium frequencies, and for high power RF heating applications.

The valve is rated for use as an RF linear amplifier and an AF amplifier or modulator as well as for the main design applications.

In 2002 we know that a pair of these valves are in use for the BBC Radio 5 transmitter.

The filament/cathode is of thoriated tungsten. Although the anode rating is given as 20 kV it would be normal to operate it at about 15 kV. The current would likewise be less than the maximum quoted, probably five to ten amps.

The type designation and manufacturer is clearly printed on the side of the cooling fins.

Cooling is by high volume forced air. The nature of the fins can be seen in both the picture of the lower end of the radiator, and the image of the top of the valve.

The handles at the top of the valve are essential as the valve weighs 22.70 kg.

The wide metal tube envelope is 248 mm in diameter and, is 440 mm tall.

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	mAa	freq	Pout	Pdiss
	10.0	295	20,000	750	15,000	30MHz	150kW	35kW

This exhibit was last updated on 10 August 2006