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The CV3543 (commercially the 4D32) is a rugged beam tetrode for RF power amplifier service in mobile or airborne systems. As a Class C RF amplifier full ratings apply into the low VHF at 60 MHz. 100 Watts is possible.

As a Class B audio amplifier a pair can deliver 125 Watts output.

The KB/Q identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Q identifies the maker as English Electric Valve Co., Chelmsford.

The anode is multi finned for maximum heat dissipation. The insulators are ceramic for preventing breakdown under high peak voltages.

The warning notice - possible X-Ray emission?

The top components include a double thickness mica disc to resist vibration. Copper supports for the control grid and flat cathode. The beam plate is just visible on the right.

A clear indication of the anode geometry. The control and screen grids, not visible, are aligned so that electrons not impacting on the control grid also bypass the screen wires.

The anode connections and supports.

The wide glass tube envelope is 54 mm in diameter and, excluding the B7A base pins, is 117 mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.