33 @ The Valve Museum

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33

Sensibly equivalent^¶ to:

VT-33

Extras ▼

National Union Photographic Donation - Mark Mallison Other 33 exhibits

The Type 33 is an audio output pentode. It is a battery valve with an output of 1.4 Watts maximum. The anode load impedance is given as 6,000Ω.

This exhibit is marked as Special Export Tested.

The filament is a single inverted V. The outer grids are wire wound.

The base pins

Thanks to Mark Mallison for sending the images.

The classic envelope is mm in diameter and, excluding the UY base pins, is mm tall.

Reference: Data-sheet. Type 33 was first introduced in 1936. See also 1936 adverts.

Pin Connections

UY	1	2	3	4	5
	f+	a	g1	g2	f-

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	μ
	2.2V	0.26	180	180	-18	22	5.0	55,000	1.7	90

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated August 12, 2021.

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