Shootout of Nos 6sn7 tubes

@RealMcCoy
If possible- grab a magnifying glass and look closely at the numbers that are located on the glass pinch just above the tube socket. These may/may not be helpful identifying your tubes. (See attached of one of your tubes).

1759764715805.jpeg
 
I noticed your post of these on the other forum as well- are you sure there aren’t any other numbers stamped into the base? All of pics show the same view point.
Only "Made in U.S.A. 6F8G" is written on the base, it's blank on the rest.
 
Only "Made in U.S.A. 6F8G" is written on the base, it's blank on the rest.
Nothing more above the base as highlighted on your picture?
 

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