*

One tube, circa 1950s, USA made by ?????,
type 5751 vacuum tube
as pictured.
<<<<<<< As pictured = What you see is what you get! >>>>>>>

Silk-Screening:
no more graphics left, please see photos

Acid Etched Designation:
5751

Painted Designation:
nil

Date Code:
nil

Tube features black-ridge-plates, 3 mica spacers, copper grids, no extra support rods between mica spacers and a tilted mount 'slightly-bent-rectangular' getter on top.

*

Hickok TV-7B/U* tested

Test Result(s)
Tube#1         50/49                

minimum (65% of NEW) recommended for a good tube
32/32

(Triode#1 / Triode#2)