Triplett 3444 Tested Matched Pair of Sylvania JAN-CHS 5Y3GT VT-197-A Rectifier tubes.  Feature black plates with rare bottom-mounted SOLID FOIL "D" getters.  Test VERY STRONG beyond NEW / NOS levels.  Results:

TUBE 1:  29.3 (109%) NEW

TUBE 2:  32.7 (121%) NEW

      All tested tubes are analyzed on a newly rebuilt and calibrated Triplett 3444 Mutual Conductance Tube Tester with digital plate current meter.  This tester was professionally revamped in November 2016 by C.G. Industries who are the absolute best in their business hands down.  Only military / industrial precision parts are used and the tester is FULLY calibrated to the exact specifications of the assembly line master model for precise accuracy.  

     All tubes are checked for shorts / leakage ; transconductance measured DIRECTLY in micro(mhos) (no mathematical interpolation involved); emissions / plate current (mA) (read with digital meter for accuracy); and gas / grid current.  Tubes are considered "matched" within 10% value for mhos or mA.