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Joe comments that the Daven 01-A is quite rare. The 01A in general was a standard triode and was made by many companies under various Type designations. Here we reproduce the PDF data-sheet of the Cunningham implementation.

Thanks to Joe Gruber for sending the images.

The balloon envelope is  mm in diameter and, excluding the UX4 base pins, is  mm tall.

References: Data-sheet, Data, ¹⁰⁴⁷ & ³⁰⁰². Type 01-A was first introduced in 1925. See also 1925 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.