6SN7在Tubeworld（国外一个著名的卖管的网站）上的排名，注意年代。
6SN7GT SONIC RANKING
BEST SOUNDING 6SN7 AND EQUIVALENTS (6SN7GT/GTA/GTB/WGT, 5692) ARE THESE:
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ECC33=CV2821 Mullard (can be subbed for a 6SN7GT, max plate volate 300V, superb sound, the best overall, 1950's)
ECC32=CV181 Mullard (can be used in certain applications in place of a 6SN7, max plate voltage 300V, superb sound, 1950's)
6SN7W Sylvania "chrome top" 1940's (metal base and black base)
6SN7GT/GTB/WGT Sylvania "chrome top" 1940's-1950's
CV1988=6SN7GT/GTY Brimar England 1950's and early 1970's (Y=brown base)
VT-231=6SN7GT Raytheon, Sylvania, Tungsol, Ken Rad, RCA 1940's
6SN7WGT Raytheon ribbed plates 1950's - 1960's
5692 RCA Red Base (early 1950's are best)
5692 CBS-Hytron and Sylvania Brown Base (1957-early 1960's)
6SN7GT/GTB/WGT Tungsol 1950's-1960's
6SN7GT Ken Rad
6SN7GTA GE early 1950's (black plate)
6SN7GT RCA early 1950's
6SN7GTB Sylvania late 1950's-1970's
6SN7GTB RCA late 1950's-1960's
6SN7GTB GE side-getter late 1950's-1975
6SN7WGTA Philips USA made by Sylvania 1970's-1980's
6SN7GTB RCA, Sylvania, GE coin-base 1970's-1980's
6SN7GTB Japan 1970's
6SN7 Russian (harsh highs, thin sounding)
6SN7 Chinese (junk, do not use)
