Buying NOS can drive you a little crazy. I have learned to live with (and enjoy) the sound of current tubes in my ARC preamp (an LS7). I'm using the Electro-Harmonix 6922, available at many dealers (I like www.tubedepot.com). Some folks in Tube Asylum also have kind words for the current JJ/Tesla. These don't cost a lot compared to vintage Amperex or Siemens. Of course they don't have any audiophile cachet, but I can live without that. In my system, the EH's sound darned good. Maybe worth a try for you as well.
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