Thegoodarcher,
You should read Jeff Day's (writes for Positive Feedback, also 6 Moons) blog at Wordpress, concerning 6L6s, Jeff did a tube shoot-out in his Leben 600; the 6L6 that won out was the NOS Reflector 6n3ce. They can still be gotten. Jim McShane was selling them for about $65.00 per quad. McShane is out of stock. I use these tubes in my Primaluna Dialogue One. Terrific tube. Inexpensive, but will last for years and sound great. Look around the Internet. I believe I saw them recently from reputable sellers. I do have spares, but not selling them currently. Good luck, hope this helps. Check out Cyroset tubes on Internet. Again, best.