I've owned both and the Line 1 is more neutral sounding than the Quicksilver (less tube sounding). My guess is that is the difference you are hearing. Tubes do make a difference but I don't believe the two preamps will ever sound alike.
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The good news is that you have a great preamp. (I used to sell them, a long time ago in a galaxy far, far away.) A great piece of tube gear will sound like the tubes and not have much character of its own. And, since the Sonic Frontiers is a great piece of gear, it will, indeed, sound like its tube.
Sonic Frontiers used to recommend Valvo's for your preamp--until they ran out of them! Although, those aren't the best around.
Your Amperex's are fantastic tubes, so I would stick with them.
But, if you want to beef up the bass, I would recommend that you get a pair of mid-sixties Siemens & Halske E88CC's, or CCa's--not the ones with the D-getter. They will have an O-getter.
You should put them in the middle row--which is the most important one--put the 6922PQ's in the front and rear rows, and pull out the Tesla's, for now. The Tesla's are great. Don't get me wrong. I just think it would be easier for you, if you rolled, systematically.
Listen with the Siemens' for a while. Then, try swapping out the PQ's in the front row for the Tesla's. Finally, put the PQ's back in front and try the Tesla's in the third, least important, row.
If you do decide to pick up some Siemens', this guy on the 'gon has some good ones for good prices. This is the internal link to his ad: http://buy.audiogon.com/cgia/cls.pl?accstube&1203962172
I hope this helps.
Order of importance,
Run the Amperex PQ tubes in the middle and the back row, Tesla in the front row. Try that and post back.
I also recommend Herbie's HAL-O tube dampers.
Install them near the top fat part of the tubes.
Jea48's right. I got the importance of the front and back rows confused. My bad. Also, he is right that you should try his suggestions, first. (They're a heck of a lot cheaper, for one thing!) I don't know why, but I thought you had told us you had done that tube swap, already.
I'm not sure if Herbie's Ultrasonic dampers will give you more bass, or not. But your tubes will, definitely, sound better, less harsh. Maybe more apparent bass. (I use them, myself.) Actually, Herbie does make a specific type of tube damper to add bottom weight. It's called the "Peek" series. But, I haven't tried them, yet.