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Would 24UM be better, probably not but with this size purchase I thought it wise to ask.
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These tubes came in our last "18UM" shipment, so...
The 24UM/UA is just a basic minimum spec threshold for purchasing purposes, however the overall quality of L3Harris tubes is continuing to improve as time goes on.
Because of the volume of tubes we purchase and receive, a modified 18UM contract like ours still nets plenty of "super tubes," and our custom spec requirements above and beyond what the standard 18UM specs are make them all extremely high quality tubes.
The 20, 22, 24, 26UM/UA tubes are often favored by small batch builders even though they are more expensive for the same tubes, because they are buying in much smaller quantities.
~Augee