This 12E1R is a magnificent device. Given the firm metal skirt and method of construction, it is very likely that this is a rugged version of the 12E1 series pass valve.

The oval anode and strap anode connection are clearly visible. A mica sheet at the top of the metal skirt hides the support structure.

The 12E1 is a power output valve for use as a series pass valve in stabilised power supplies. The heavy demands placed on valves used as control elements in regulator circuits makes it vital that the ratings are not exceeded.

The wide glass tube envelope is 36 mm in diameter and, excluding the IO base pins, is 119 mm tall. The skirt maximum diameter is 42 mm.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	-	h	-	g2	g1	-	h	k	a

 
Absolute Maximum Operating Conditions

Beam Tetrode	Vh	Ah	Va	Vs
	6.3	1.6	800	300

This exhibit was last updated on 13 August 2005