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Let's see. I believe that 6146s and 12BY7As are still available and they will be for some kind, some time. There are also, if you do some tube search, there are industrial equivalents of these tubes like the 6146s of W. And there's another one, another designation. The reason I say that, I've got an RCA transmitting tube manual right in front of me here. I could look that up, but you can find these tubes. You can find Chinese copies, you can find Russian copies. You can even find some tubes on Amazon of all places. Of course, Amazon also sells left-handed electric nostril inhalers. But you could find some of these tubes. You can click for the...