The R19 is an EHT rectifier for television service. The anode voltage quoted is the peak inverse voltage and this is important in a television EHT generator as the waveform is pulsed and not a sine wave.

The R12 has a higher specification than the 1X2B and can be used as a direct substitute for the 1X2B.

The filament screen can be seen below the anode as a circular plate with a central hole for the filament.

The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 62 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9	tc
	s	f	-	s	f	s	-	f	f	a

 
Absolute Maximum Operating Conditions

Rectifier	Vh	Ah	Va	mAa
	1.25	0.2	25,000	2.0

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 09 March 2008 {find valves by name}