The 4CX150A beam tetrode is a close relative to the 4CX250B RF power output valve and has the same finned anode structure. The silver plated fins are contained in an outer ring, and in use air would be forced over the fins for anode cooling. A special base and chimney were designed for the purpose.

The base is a glass disc with pins protruding through. The evacuation seal is covered by a central metal spigot.

The co-axial envelope is 40 mm in diameter and, excluding the B8F base pins, is 44 mm tall.

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	mAa	Pout	freq	f.max
	6.0	2.6	1250	300	150	195	165	500

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 02 July 2007 {find valves by name}