56 @ The Valve Museum

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56

Sensibly equivalent^¶ to:

256 A256 C-56 CV611 ER56 G-56 PH256 PH56 VT-56

Extras ▼

Unknown TNMoC The National Museum of Computing - Valves Other 56 exhibits

The Type 56 is an indirectly heated audio triode on an American UX5 base. The later Type 76 is the same valve but with a 6.3 Volt heater.

The anode seen end on.

The pinch and triode assembly. The insulated heater is twisted together to minimise external magnetic fields and thus induced hum.

The classic envelope is 38 mm in diameter, and excluding the UX4 base pins is 88 mm tall.

References: Data-sheet & ³⁰⁰². Type 56 was first introduced in 1932. See also 1932 adverts.

Pin Connections

UX5	1	2	3	4	5
	h	a	g1	k	h

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	2.5	1.0	250	-13.5	7.5	9,500	1.45

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated August 03, 2020.

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