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Tungsol code, trying to figure it out, any helpers out there that may no when these 6SU7GTY's were manufactured. They have the round plates if that helps.
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The June 1951 acceptance date printed on the box indicates the tube was made no later than June 1951. That's true assuming your tube indeed is the tube that originally came in the box. From the photo you supplied your tube most likely is the original.The 3221-24 printed on the base of the tube provides the date detail you inquired about. Within that code, the 322 indicates Tung Sol manufactured the tube. The 1-24 indicates the tube was manufactured during the 24th week of 1951. The 1 in 1-24 in this case defines 1951 as the year of manufacture. And the 24 defines the specific week during 1951. The 24th week pegs the manufacture to early June of that year.
Nice looking tube!
Edits: 06/29/16
Very much appreciated JazzDude. Looks like acceptance date and manufacture date are about the same.
BH
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