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The 6D1 is a signal diode for decoding AM signals after amplification. It was used for television vision detection.

The only difference between the 6D1 and the EA50 is that the latter is rated for an RMS input no higher than 50 Volts. As a vision detector the input is likely to be much less than this.

The 6D1 was used in the 1948 Murphy television receiver V114 as the vision second detector.

The thin glass tube envelope is 11 mm in diameter and, including the B3G base pins, is 46 mm tip to tip.

References: Data-sheet & ¹⁰⁴⁰. Type 6D1 was first introduced in 1938. See also 1938 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.