This listing is for a good used antique Raytheon type 56 triode vacuum tube.
This tube tested great on a reliable Hickok Model 800A tube tester (a dynamic mutual conductance tester). ... and NO shorts or gas detected.
Here is the reading in micromhos: 2025 - well above new tube standards!
Ref: Minimum readings should be 870 micromhos and new tubes should test at 1450 or more micromhos.
Note: This tube has a slight rattle, but nothing is visible inside the glass bottle. Probably some loose hardened glue that is trapped inside the base.
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