This is an NOS (New Old Stock (It is a little box worn)) JAN Sylvania 6189/12AU7 vacuum tube. Grey plates and top halo getter. Original box.
The pins are clean and none bent, Glass seal around pins shows no crack. Tip top is not chipped. No shorts indicated when testing this tube.
It has been tested on a Hickok 539C and was tested for Transconductance Gm. and plate current in Ma. Tested as follows.
Triode section #1 3100/19500 at 8.5ma.
Triode section#2 3200/1950 at 8.0ma.
As usual the standard min value for this tube on the 539C is 1950 uMhos. Transconductance. Label is very clean and fully intact. This is a very nice tube It will be shipped USPS Advantage ground USA and international shipping will be USPS first class international small package. Thanks for looking and check my other items.