You would think the Sovteks could be bettered, as sheltie Dave says. Certainly the Sovtek 12ax7 was easy to improve upon, IME. That was not in a Leben though. I know a few months ago, someone was selling a NOS 300X, older version with Mullards. I can't tell you if it sold, but do remember the seller was asking alot. Easily $500 more than you would normally see an XS come up for. Of course we can't gauge too much on what one person sold one 300X for.
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