The last time I bought anything upper crust from the 12AX7 family, in a Tele or Siemens, I got them from a seller in west Germany. He had his own website then, and I dealt with him a few times. Now he sells on eBay as 'audiotubes_de'. Very reliable and honest. He does have these listed currently:(http://cgi.ebay.com/2-NEW-NOS-Tubes-Siemens-Telefunken-ECC83-12AX7_W0QQitemZ160410679934QQcmdZViewItemQQptZVintage_Electronics_R2?hash=item255938ba7e) For a few years my tube compliment has consisted of Siemens CCa's(6), Tungsol 6SN7GT(RP-2) and Sylvania 6SN7W(tall bottles-2), so- I've not had occasion to hunt the 12AX7 woods for awhile. If you desire the clean sound you describe; stick with the early Tele and Siemens offerings(50's to early 60's). Happy listening!