Always long for (upgraded) first love: Sonic Frontiers Line 3

+1 to BRF's comments.  I also owned a Line 3 with SE+ and Dueland copper foil caps installed as well (they barely fit).  pcX and I coined it the 'Platinum Plus' Line 3 :-).  Still retains the 'too neutral' sound- bass is decent, but missing the organic qualities of top quality competitors.  IMHO, the volume control is a major problem, and is digital-relay in design- likely as a cost-saving design parameter- too bad.  I sold it and won't go back- my current BAT Rex kills it in every parameter.  **However, all this being said, for the price, if you want a fully balanced, quiet and neutral-sounding pre, it's tough to beat.

I appreciate both of your comments as previous owners who underwent the upgrade path. I do love the sound that is neutral and details but I enjoy the sparkles and organic sound of tube. Line 3 is really for my fond memory of SFL-2/Krell KSA 150 combo twenty years ago. My current amp is musical fidelity KW550 integrated amp with RCA red base tube which sounds fine to me. I have been interested in BAT Sex as well. You guys probably save me from upgrading Line 3 which is going to cost a bit. 
I recently acquired a pair of single ended triode 300b/805 monoblock from a small company called TS Audio inThailand during my visit there. Although the finish is at best a nice DIY quality, the sound however is very nice, better than Cary 805 that I listened to so I figure Line 3 would be quite fun to play with this thing.

It's like I want to spend a weekend ex-gf from years ago that got some augmentation before moving on to the young hot one...lol