i would say that the seller either tested the tubes on a number of different tube testers, or retested tubes that had been tested by a previous supplier. The numbers <100 are gain or quality measurements and the numbers >2000 are transconductance measurements. Each set of two numbers indicates how closely the two sections of each dual triode are matched.
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Amplification: McIntosh C2200, NYAL Modified Super-it, Private design Tube monoblocks with Tube-regulated power supplies Sources: Linn LP12/Lingo/Ittok LVIII/Shure V15VxMR, Linn Unidisk SC, ADL GT40, Oppo BDP-105D, Magnum Dynalab Etude FM Tuner, Bell Expressvu 9200 PVR (2) Video: Pioneer Elite Kuro PRO 110FD (50") Speakers: Private design Folded back-loaded corner horns (3-way: JBL drivers) Cables: Linn Silver, Audioquest
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