Sensibly equivalent¶ to:
The 2D13A is a single ended double signal diode. The 2D13, with top cap, and 2D13C with a conventional B5 base cap (albeit of small diameter - see exhibit 2D4A) are electrically identical.
The 'P5' side-contact base cap was, we think, a Philips special (P = Philips?) and was also used on a few TV tubes, including the miniature MW6/2 projection tube.
Valves with side-contact base caps were widely used in Philips sets during the 1930s but some other set manufacturers disliked them so Mullard were forced to market '-C' versions of their side-contact types.
The classic envelope is 28 mm in diameter and, excluding the Ct5 base pins, is 78 mm tall.
References: Data-sheet & 1043. Type 2D13A was first introduced in 1935. See also 1935 adverts.
Absolute Maximum Operating Conditions¶
PDF scanned from an original document held by the museum
Updated April 03, 2014.