6146W JAN Sylvania Vacuum Tube (aka 7212), MATCHED PAIR, Hickok Tested

This is a Sylvania tube, a 6146W.  The W means it is the rugged version of a 6146.  It's also the same as a 7212. 

It's a JAN tube, which means Joint Army Navy.  JAN tubes are known for their ability to stand up to harsher than usual treatment.

Tested on Hickok 533A, Gm recorded on side of the tube box.

A "matched pair" means the mutual conductance of one tube is within 10% of the other tube. 

Black plates, green print. 

Photos are of one example of the available matched pairs.  It may or may not be the same tube you receive.  

Made in USA.

Ships quickly and safely from Mississippi.