The CV753 is a miniature diode on a B7G base and features a 1.4 Volt indirectly heated cathode. Normally dry battery valves are directly heated. Such a valve would find applications where the cathode is not taken to ground or where the filaments of other valves are run in series from a higher voltage supply. Two such valves could be used in a discriminator in an FM radio in the 1950s.

This valve is from the 1940s yet the heater wire is a single thread running vertically through the anode cavity, just as the earliest valves were made.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 45 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	h	a	k	-	-	a	h

 
Absolute Maximum Operating Conditions

Diode	Vh	Ah	Va	mAa
	1.4	0.15	117	0.5

This exhibit was last updated on 31 March 2008