This auction is for a good used antique National Union type 27 triode vacuum tube with an engraved base.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: - 1150 - above new tube standards!Ref: Minimum readings should be 600 micromhos (60%) and new tubes should test at 1000 or more micromhos. Satisfactio...n guaranteed! -- $-$-$ -- Check out all the other items I have for $ale! -- $-$-$**** FREE domestic economy shipping & handling on this item! ******* Priority Mail ONLY for ALL International shipments - NO exceptions! *** *** PLEASE make payment within (5) days of the auction ending. Thank you! *** *** PayPal is the ONLY method of payment accepted ****** As a seller, I promptly leave feedback after receiving positive feedback ***