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#2
03-25-2014, 08:14 AM
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Allright, I'll start the ball rolling:
621TS Walnut serial number: C 003539 sound discriminator: 6AT6 original tube set dated 6-17 to 6-35 earliest estimated production date: End of September 1946 this may tell us when 621s were produced, production changes,when they stopped producing them, and perhaps other things. I'm betting there are other 621s there with original tubes still installed. Check them and see! 
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