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B-6

 
    
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This Donle-Bristol B-6 exhibit was found in the offices of the New York City law firm of Pennie, Davis, Marvin and Edmunds. Their address being 165 Broadway. We have several exhibits that were found in filing cabinets in their offices. Valves of the early 1920s clearly had reliability issues.
See B-6 that looks to be the same valve.
The original box is quite rare, especially in good condition. Thanks to the law firm for keeping this safe for so long.
Thanks to Joe Gruber for sending the images.
The envelope is  mm in diameter and, excluding the UX4 base pins, is  mm tall.
Reference: Joe Gruber.

 

Pin Connections
UX4
1
2
3
4
g1
f
f
a

 

Updated February 12, 2021.
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