Single vintage Raytheon 6J5GT metal base vacuum tube. Tested 100% mutual conductance on my calibrated Hickok tube tester. These are excellent sounding tubes with a solid made in the USA build integrity. Mutual conductance reading below. 

100% is 2650

Tube 1: 2850

Always packed professionally and usually shipped the same day of purchase. Please check my feedback and buy with confidence. If you have any questions, please feel free to ask, my name is Mark.