Looking for EL84 Tone Comparisons by Tube Brand

[TUBEDUDE]

Upscale Audio, seller of moderately expensive stereo equipment, also sells tubes. They are matched for Ip and Gm, at high voltages where they are most likely employed. Although they are one point matched I have had great luck with them in my designs. I guess that one point is near enough to my operating points not to matter. Or deviation from that point is more trivial than I expected.