After watching this thread closely for a long time, it's time for me jump in. I have been proud owner of a newer model Cortese for about 3 months. The Cortese replaced a SF Line 3SE without blinking an eye. My unit has the latest phono stage Mick introduced in 9/04. I listened to the stock tubes for about 200 hours before I started rolling some NOS tubes. I replaced the power supply tubes with a Mullard 5ar4 & Tungsol 5881's. The Line stage received a pair of black bottom RCA 6sn7's, the phone stage a pair of Tele CCa's. I didn't replace the Phillips E180f's or the Sylvania 12b4a's that are stock with the unit. When I replaced the tubes, there was an imediate improvement as I suspected there would be. These tubes were extremely transparent, very detailed, nice spacing between the instruments which made a more defined soundstage, but after about 300 hours of listening I felt the bass was too thin for me to be extremely happy with the tubes. I decided to play around with some other 6sn7's. I replaced the RCA's with a pair of Sylvania 6sn7's and these had most of the characteristics of the RCA's, bass slam was better detailed, but the music felt too forward in it's presentation. The next pair I tried was Tungsol's 6sn7's & bingo! The Tungsol's are open, detailed, natural, and the bass is strong, punchy, and tight.
Thanks to everyone on the thread for helping out so much.
Thanks to everyone on the thread for helping out so much.