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211 and 811 are both thransmitting triodes, but thats the end of the similarities. 211 is a lot bigger. Be wary of some of the variants, some brands made them with differnt Mu for other applications. I think the Chinese still make a version of the 211. Ive seen ads for them in late 40s radio magazines for like 69cents each. Sure would be nice to run across a case of them in the estate sale of an old ham radio operator...
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