The CV1756 magic eye tuning indicator is from RCA who designed the first such tuning indicator in the 1930s. The operating characteristics for this exhibit are the same as for type 6E5. The american service code is VT-138 and this is the designation stamped on the base.

The domed end window seen straight on.

The end window with target components together with the triode amplifier on the left closer to the base.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 83 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	-	h	a	t	g1	-	h	k

 
Absolute Maximum Operating Conditions

CRT	Vh	Ah	Va	mAa
	12.6	0.15	250	0.25

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 February 2008 {find valves by name}