Thanks to Pilgrim I bought a Shuttle 6.2 on closeout. I was happy with it until I watched a comparison video between it and a Streamliner 900. Shuttle has 1 12AX7, Streamliner 3 and the tone circuit approach is different, Streamliner is old school Baxendahl, Shuttle more modern with sweep parametric and shelving with a footswitch for versatility. Both were made in Taiwan, known for great quality. 3 year warranty.
Dimensions are close, Streamliner is an inch taller and longer but a lot sexier looking. Shuttle is all square edges and has almost a hobby box look. Knobs on Streamliner are a little larger and easier to operate, and there are fewer lights. Streamliner weighs 6+ lbs, Shuttle 4+
Backpanels are similar but Streamliner doesn't have a footswitch. Shuttle has Shelving switches and the footswitch is a nice option for those.
Streamliner uses allen heads to secure the top, Shuttle phillips heads. The Embossed "GB" is a nice touch.
Shuttle bottom has 16 protruding Phillips head screws and glue on feet, the screws on the Streamliner are all recessed including the 4 feet.
Sides. It's obvious a lot of thought was put into the Streamliner's looks. It was the top of the Genz line and looks like a high end piece of stereo gear.
...and it seems to give a nod to Ampeg when it's powered up.
Yeah, but what's the difference in sound? IMO bottom end is tighter with the Streamliner and it's easier to use. Controls shown are where I set it for a pair of ThunderBuckers: bass cut, 600 mids boosted, treble flat. That's connected to a '67 B-15 cabinet YMMV.
I paid $600 for the Streamliner, $400 for the Shuttle. Worth the difference in sound quality, ergonomics and looks to me. Plus more head room, gain and 50% more power.
For more on the Shuttle vs Streamliner tone differences check this at around 2.20