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Sylvania Letter Date Codes

I am trying to decipher the date codes on 2 pairs of Sylvania 6DR7 tubes.
There are no numbers.
One pair has has two letters: ig, and then below that EGP.
The other pair has two letters: ga and then below that ETJ.
Thanks!


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Topic - Sylvania Letter Date Codes - UN 22:15:52 07/10/21 (0)

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