I purchased this matched set of tubes in 2003 from a reputable Svetlana dealer. These 8 tubes were tested in my McIntosh MC2000 for 20 hours and then put away as a back-up set. I sold the MC2000 and never used them. These are the good ones with the square holes in the plates and great sound. McIntosh used these as the original tubes for the MC2000 so you know they sound good. These are the KT88's made in St Petersburg, Russia and were matched at the factory. Most of the screened information has come off the tubes but you can still see the winged 'C' on some and factory markings. Will ship via priority mail for $11.35.