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The CV1343 is an indirectly heated HF pentode and the base valve for the design was a modified 1937 KTZ73. The old Army service code is ARP38 and the GPO code is POVT149. Note that this valve has a 4.0 Volt heater and the later KTZ73 has a 6.3 Volt heater.

The interesting thing about this exhibit is the metal foil screening rather than zinc loaded paint.

The KB/Z identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Z identifies the maker as MO Valve Company, Hammersmith.

The foil stretches over the top of the envelope suggesting that it is aluminised plastic. The top cap connection to g1 is easily seen.

Thanks to Mark Mallison for sending the images.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 80 mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.