The Schickerling S-8100 and box were purchased from a radio shop in New York City on Cortland Street. Scratching on the valve base and writing on the box indicate that there was a court case. This was probably because the valve did not function or function properly.
The original box. This was found in a filing cabinet of the New York City law firm of Pennie, Davis, Marvin and Edmunds. Their address being 165 Broadway.
Thanks to Joe Gruber for sending the images.
The envelope is mm in diameter and, excluding the UV base pins, is mm tall.
Reference: Joe Gruber.
Absolute Maximum Operating Conditions¶
Updated February 12, 2021.