The CV1505 designated valve is a direct equivalent of the commercial M-OV MH41 triode.

This is described as an indirectly heated high slope general purpose triode suitable for detector of AF amplifier service etc.

The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 94 mm tall.

References: Datasheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type CV1505 was first introduced^¶ in 1933.

 
Pin Connections

B5	1	2	3	4	5
	a	g1	h	h	k

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	200	-1.5	5.2	13,300	6.0

Thanks to Frank Philipse for supplying the above PDF datasheet