Looking for warm tube preamp (should pair well with Pass power amp), budget $6000

If you want to get a warmer sound from your SLP-05 try some NOS tubes. I love the old Sylvania tubes in it. Fuller and smoother then the stock tubes and just all around better sound. If you want a much warmer sound try NOS RCA tubes. I prefer the detail of Sylvania’s but everyone has a different taste and depends on the rest of your equipment. Try Brent at audiotubes.com. He’ll be a great help and his page tells a lot about the sound of different types of NOS tubes.

A tube change can greatly alter the sound. With new production tubes there sometimes isn’t as huge a sound difference. Some are just bright and edgy.

For the Cary SLP-05, it uses 6 6SN7’s.  Two for the balanced inputs and for for the balanced line section.  Not sure why your mentioning the 6H30 and 6N6P.  What am I missing?  I was only talking about retuning the SLP-05. 

I’d pick up a used Cary SLP-05 preamp and then send it in to them for the Ultimate Upgrade.  Huge improvement over the stock unit.  smoother and cleaner with better low level resolution.