Sonic Frontiers Power 1 Tube advise

Replace the 6922's first with 6DJ8"s and you will get fast bottom end with a more musical midrange. Everything seems to come to life. The VALVO's work great in POwer-1's and will make a bigger difference than changing the output tubes. If you do want to change the 6550's than the KT88 is the way to go.

In the Power 1, you can get more midrange bloom with Ei KT90 Type 3. Note we recommend them for the Power 1, but not the Power 2. We have also had a great experience with the Svetlana KT88 in that amp. Smooth and musical. DO NOT use the Tesla KT88. They have been very problematic. Then for even more confusion, there is a Chinese KT88 that looks just like the British classic Gold Lion. They were sold by Gold Dragon for a while, and have been unavailable, though we are supposed to get 100 or so soon. That tube is dependable, and sounds great with the little more extension at the tip top if that is what you want. Valvo never made a 6922. The ones you see being sold everywhere nowadays are older Tesla. We have some Valvo branded 6922 that are the real thing, made in Holland by Philips NV in 1964, but they are very rare.

Wally, I know you're familiar with SFI gear, cause I bought a pair of amps from you. As you might know I also have the whole 3 line of SFI (T3/P3/L3) -and soon in a month or so when I get them- Power 3. I have been using them for few month now and happy with them. But my amps are the 7Bs and speakers are the ML "ReQuest". As you can in another thread, this combination is not perfect particularly in the highs (too edgy specially at high volume). Now, I was thinking to upgrade the tubes in the Line 3 preamp. SFI tech recommends the Valvo ECC88 to replace the Sovtek 6922s. Others recommended the Amperex 7308. Or shall I wait for the amps to come? Also what upgrades would you guys recommend for the Power 3 if any. The same question I would ask the guys of Upscale audio whom I heard some good things about their knowledge on the web.