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The XD from Hivac in 1935 uses the much older Peanut bayonet base. The XD was designed for detector use.

The anode is an open mesh and the filament is a single hairpin.

The triode seen along the grid axis. Note the thick support rod on the right.

In this image it can be seen that the anode is almost rectangular with the grid wires parallel to the anode.

The thin glass tube envelope is 14 mm in diameter, and excluding the Peanut base pins is 57 mm tall.

References: Data-sheet, & ¹⁰⁴³. Type XD was first introduced in 1935. See also 1935 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Andy Cowley for supplying the above PDF datasheet.