The DAF96 is a dry battery valve and exhibits very low filament consumption. This is one of the last generation of dry battery valves, and dates to the early 1950s when portable radio sets were still based on valves. It was designed for detector and first audio stage use and can be found in the small suitcase portable sets of the period.
The filament tension spring can be seen at the top. The single strand filament passes first through the diode anode before entering the pentode.
The diode anode face view above the top mica. The top mica guides the filament so that it passes centrally through the pentode.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 43 mm tall.
References: Data-sheet, 3002 & 1040. Type DAF96 was first introduced in 1953.