Three (3) 6SN7GTB Zenith and Rauland and Motorola by Sylvania vintage vacuum tubes, made in USA,

all are black ribbed plates, chromed dome

close date codes MY and MZ (made in November and December 1962), 

tubes tests:

88, 84 %
88, 86 %
88, 88 %

Price is for all tubes pictured.

We test all tubes we sell! We will combine shipping! Check out my other tubes!

Scale 1-100, good quality percentage on my Triplett starts at 54.