Serial number is not important. Tube model, contract, and NSN are the important details here. I used to think OMNI contract mattered a lot, now I'm realising it doesn't really matter at all. Specs of the specific tube are what is important. My tube is OMNI VI, however the contract and tube minimum specifications are closer to OMNI VII minimums. I've looked through an OMNI VIII tube that had a min spec of 30 SNR and 72 lp/mm which is way above the OMNI VIII minimums.
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