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Eimac no longer makes glass tubes. The only option is from China. All the 3-500 variants are basically the same. The old 3-500Z had a thinner plate than the newer 3-500ZG. The G stands for graphite and is a more rugged tube. Users of Chinese tubes claim that the one's from RF Parts and specifically labeled RF Parts are the better ones as they have been picked out of the mix and tested. RF Parts stands by their product too it seems.