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This Zaerix branded DK96 was made in the GDR (East Germany as was after WWII).

From the early 1960s battery valve radios lost out to the imported transistor radio. In 1964 a Japanese six transistor miniature superhet radio operating on a PP3 battery could be purchased for little more than a 90 Volt HT battery.

The bright anode with wire grids within. The diagonal rod at top right is the filament tension spring. The filament is a single wire with an oxide coating and consumes only 25 mA from a single LT battery.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type DK96 was first introduced in 1953. See also 1953 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.