There are new 7581's being manufactured and from what I've read, they are very good, perphas better than original. I don't remember which, but one brand (EH?) is the same size as the original. Others are the size of a 6L6, and likely will not fit into those compact chassis. I tried to fit one into my son's 299D and it would not work (could not put the case back on). Anyway, I think it is the Electro Harmoix one thta's the right size. Check Antique Electronic Supply or Triode Electronics.
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