705A @ The Valve Museum

▼ Menu

Home Search Indexes Equivalents Articles Adverts & Boxes Timeline Collections Donate Contact

705A

Sensibly equivalent^¶ to:

2J/40E 2T/450E A232 CV3587 CV8238 TH705A

Extras ▼

Western Electric The Communications & Electronics Museum Trust Other 705A exhibits

The 705A is an EHT power rectifier with a PIV rating of 35,000 Volts. The average rectified current is 100 mA with a peak of 500 mA. The construction is all glass with the lead-out wires being fixed to the main pins that are held in a ceramic disc outside the envelope. The special base clamps to this ceramic disc.

The filament is thoriated tungsten and when powered glows a bright orange.

See 705A from Western Electric for more details. This exhibit shows a different style of lettering.

The wide glass tube envelope is 58 mm in diameter, and excluding the B4A base pins is 117 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 705A was first introduced in 1943. See also 1943 adverts.

Pin Connections

B4A	1	2	3	4	tc
	f	fct	f	nc	a

Absolute Maximum Operating Conditions^¶

Rectifier	Vh	Ah	Va	mAa
	5.0	5.0	12.000	500

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 05, 2022.

Return to Main Index