Here we have (1) Hytron made for Western Electric VT-52 Vacuum Tube.  VT52 etch on the glass. Hytron made for Western Electric printed on base.

See photos for test results from an Amplitrex. Tested on fixed and auto bias. Results based on plate current readings, as most audio guys only care about that. Tube passed gas test.

Tube tested 96%. Emissions over 100%.

PLEASE SEE MY OTHER LISTED FOR MORE GREAT TUBES. COMBINED SHIPPING ON MULTIPLE ITEMS USUALLY AVAILABLE