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The DE2HF is a dull emitter triode dating from 1925. It was designed for RF amplification. The valves from M-OV of this period used carbonized thoriated tungsten filaments. The carbonizing reduced the effects of any residual gasses in poisoning the thoriated filament.

See also DE2LF.

The feint BBC stamp.

The feint Osram Valve on the glass.

Using the microscope the start of the word Osram can be seen.

The third style BBC stamp dates this valve to around 1927.

DE2 on the glass.

The rest of the Type designation - HF.

The balloon envelope is 35 mm in diameter and, excluding the B4 base pins, is 74 mm tall.

References: ⁴⁰⁵¹, ¹⁰⁰³ & Data Type DE2HF was first introduced in 1925. See also 1925 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum