These came in my CARY SLP-05 preamp I just purchased. The original owner told me they only had 50 hours of playing time on them, as he purchased the preamp 05/2011. I purchased it 10/2011. I have put another 50 hours on them. This is the set that comes from CARY with the SLP-05, their reference preamp. I'm giving them a 7/10 to be safe, not sure if they're premium grade or not. I purchased all new NOS tubes for my preamp. These by comparison seem more forward sounding and not quite as rich. A good sounding tube though. Check out the reviews. Typical of a Russian reissue tube. Paypal add 3%, Buyer pays shipping. Should be around $10. All original tube boxes.