Upgrading Sonic Frontiers Line 3SE to ???

I think you'll get more dynamics and slamm by going with solid state amp with more power than your current BAT amp.
SF speakers typically are laid back sounding, so if you want more slam, pair them with SS amp.
Also, you may want to have your friend bring his ARC preamp to your place to compare. This way you'll know better in your system and your room.

This may sound too simple, but if you really like your BAT VK-75SE, and you've heard and enjoy the 6H30 tubes, why don't you just try/buy a BAT VK-51SE and be done?

FWIW, yes, I agree that the 6H30 tubes are more dynamic and powerful, however, they do seem to lose a bit of that midrange bloom that tubes are famous for, IMHO. They do blend solid state and tube attributes, though to some, this is not a good thing. Perhaps it's because there are no NOS 6H30 tubes to roll, as I've found Sovtek 6922's to sound a bit sterile as well compared to NOS Amperex/Mullards/Siemens etc.

FWIW, I would try rolling the 6H23's with the Valvo and Tungsgrams, since you already have them. It can't hurt.

Happy hunting,

John

You might consider the Electron Image Amati which is currently listed for $4,100 (I have no affiliation with the seller). The Amati is designed and built by Mike Kerster, whom I believe was the design chief for the Sonic Frontier Preamp 3. In the Amati, Mike Kerster incorporated some of the technical knowledge he gained will work for Audio Note. The Amati has a built-in very high gain phono section. The Amati also has XLR outputs. I am currently using an Amati my Audio Note system. If you want any additional information feel free to contact me off-line.

Don

I owned the Line 3SE for awhile, and liked it but didn't find that it did much more for me than my SS pre at the time. I also thought the bass was just a bit loose and lacking in detail. If you can put up with no remote and a clunky 23 step volume control, you might look at either of these preamps. They sound great with solid tight bass, exceptional soundstaging and dimensionality, and grainless high frequencies. These can easily drive any length balanced output cable. Linestage tubes are 12AU7 and 6SN7.

http://cls.audiogon.com/cgi-bin/cls.pl?preatube&1170283497

http://cls.audiogon.com/cgi-bin/cls.pl?preatube&1170169406

The BAT and ARC models you listed are both supposed to sound great also. You would do best to try them in your own system, if possible, so you know if they really sound better to you than your Line 3SE.

thanks for the great suggestions.

I have not experimented with tube rolling much in buffer stage, has been running 6H23 since day one. For the driver stage, maybe it was the system and room, different type of tubes produce more difference in midrange and up but not a whole lot of difference in bass. That's why I came to the conclusion maybe SF L-3SE just does not have the bass weight I am looking for.

I should have borrowed the ARC Ref 2 II from my friend, but I did hear a highly modified LS-25 Mk II in my system and it did not produce any more bass than my L-3SE.

One of the reason I haven't pulled the trigger on BAT 51SE is the "dark" nature and bipolar user feedbacks. Some, inlcuding Stereophile review, thought 51SE was on the dark side of spectrum. Some people did not care for 51SE's sound at all which is very troublesome when you are about to spend that much money for a pre amp. Like to hear more opinion about 51SE from users that have compared it to others.