The Cossor Stentor Four, dating from 1927, was later issued as the Cossor 410P audio output valve. It has a μ of 8 and was designed for a load of 9,000 Ohms.

The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 95 mm tall.

References: Datasheet, ¹⁰⁴³ & ¹⁰⁴⁰. Type Stentor Four was first introduced^¶ in 1927.

 
Pin Connections

B4	1	2	3	4
	a	g1	f	f

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	0.1	120	-9	11.0	5,000	2.0