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Recently received 4 of these supposedly matched. They don't appear to me that they are. Is this Apex Matching for real? I have my doubts, or someone made a mistake boxing them up. At a constant plate V of 495VDC, there is a difference of 10 to 12mA plate to cathode current between each tube. The amo is a SLO100. The problem is not the amp as this difference in plate current follows each tube no matter where they are placed in the amp's power section. Otherwise, they sound fine biased @ 25 to 35mA (this is the spread between all 4 tubes in the SLO100). I've never got a bad tube ever from Antique Electronic Supply, so I'll hang onto them, and see how long these hold up where I have them set. Which according to my figures is just under 70% of max rating.
