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The YD2 from Triotron is described as a high slope power valve. This translates to a battery audio output valve.

The dome with the etched markings enhanced to make them easier to read.

The bright anode and support struts.

The electrode assembly is mounted at 45 ° within the envelope.

The balloon envelope is 48 mm in diameter, and excluding the B4 base pins is 88 mm tall.

Reference: ¹⁰⁴³. Type YD2 was first introduced in 1930. See also 1930 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶