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The De Forest DV-2 is an early triode with an amplification factor (μ) of about eight. We believe the introduction of the DV-2 was about 1923 and the version with the Isolantite base from 1924. The longer label seen on this exhibit dates from 1925.

The paper label is for recording test details.

The four short pins in the Isolantite base.

See also DV-5.

The wide glass tube envelope is 32 mm in diameter, and excluding the UV base pins is 100 mm tall.

Reference: Bill Condon & ³⁰⁰². Type DV-2 was first introduced in 1923. See also 1923 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶