The DDA/13L looks like the 2D13A the 2D4A and the DDL4. Written on the valve in pen is 2D13C. This exhibit has the Ct5 base and the 2D13C has a B5 base. The 4V could be a date code or it could be the heater voltage, if the latter then it is closest to the 2D4A.

This small double diode will have been designed for signal rectification and not as a power rectifier.

The standard way of identifying a non-uk produced product.

The classic envelope is 26 mm in diameter and, excluding the Ct5 base pins, is 80 mm tall.

 
Absolute Maximum Operating Conditions

Diode	Vh	Ah	Va	mAa
	4.0	0.65	200	0.8

This exhibit was last updated on 10 April 2008