The LMII isn't tubey at all to me....not even a little but. It has a full sound, but not tubey at all. It sounds like a warm console to me. I love it very much and used one for quite a long time.
The Streamliner to me isn't in the same universe at all as Ken seems to think. It's fat and warm, with a glassier top end (instead of the more extended, crisp top on the LMII) with a definite voicing scoop in the mids. The scoop is relaxed, and not extreme at all like many people think when they hear the word "scoop". With the LMII, you can't really approximate the scoop of the Streamliner because the low-mid frequency is too low, and the high-mid frequency is too high.
But really, all the above really only touches the surface of what these two amps feel like. What you did say is true...the LMII is fast and punchy. Agreed. The Streamliner is punchy but in an all-tube kind of way. It's most noticeable to me when standing in front of it at half-volume or better, and striking open notes on the E string with a pick. It just has that tube grunt on the front of each note, even when running in a clean mode. It feels worlds apart from an SS head IMHO, like it or not.
Now, I would say the Streamliner is more like the LMII tonally than it is the F1 or F500, that is for certain. But there's still a big gap between them. I think folks who are using the LMII because of it's warmth and size while missing the all-tube feel and attitude of much larger, heavier heads they once played might find themselves right at home with the Streamliner.
