Sensibly equivalent¶ to:
The 2D13C is an indirectly heated double diode for radio receivers from the mid 1930's. Diode one is for AGC rectification and diode two is for signal demodulation. The 200 mA heater requirement is for use in a heather chain across the mains supply in universal AC or DC sets.
The separate double diode in superhet broadcast receivers was made obsolete by the introduction of the double diode triode in the mid 1930's.
See also 2D13 and 2D13A for the Ct5 based versions also 2D13C for the unmetalised version.
The reverse is plain.
The classic envelope is 38 mm in diameter, and excluding the B5 base pins is 87 mm tall.
References: Datasheet, 1040 & 1043. Type 2D13C was first introduced in 1935.
Absolute Maximum Operating Conditions¶
Updated November 22, 2016. shape:classic construction:pinch type:double.diode age:1930.1940 base:b5 heater:200ma pins:5 pin:1.a(d2) pin:2.a(d1) pin:3.h pin:4.h pin:5.k