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RCA 5691 Vacuum Tube

Does anyone really familiar with RCA 5691 tube? I have bought a pair of RCA 5691 (listed as new) recently, adding to the 3 pieces I already have.
On the top of the new pair, there are dark emission or burned marks, which the seller has advised that it is the process of getter flashing that made these marks and not becos of heavy usage. Please advise if you are familiar with this tube. Thank you!!!

You can see my 3 pieces on the left and this new pair on the right.




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Topic - RCA 5691 Vacuum Tube - tlowe 10:33:35 07/22/21 (14)

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