The tube amp portion is a tube amplifier with lots of clean headroom.  This way it doesn't introduce a bunch of distortion as the volume is cranked up.  The amp can be played very loud and it usually sounds better the louder you can stand to play it, just like a normal tube amp.  Only the amp will pretty much remain clean as the volume is cranked up.   ie: lots of clean headroom.

Good luck

M^T

Hello,

    1) Tube power amps will have heat, but there not been any known "heat" issues with the previous Spider Valve combos.

  2) You will need the FBV Mk II to control all the looping functions from the pedal, but the FBV (Mk I) will control the amp functions.

  3) There is no current way to save the settings on your computer.   Please submit your feature request at the following link:

  Feature requests

  http://line6.com/company/contact/productFeedback/?topic_id=3

  4) I'll have to look into the cabinet construction on the combos and I'll get back to this question.

  5) the 12AX7 tubes act as a "booster" and "phase inverter" rather than the traditional "tone shaping" preamp tubes.  The tone shaping is all modeling. 

   Please be sure to award Helpful and/or Correct points to community members who respond with helpful or correct answers, and close out the ticket as “answered” if your situation has been resolved.

So andy, have you guys tested this and experienced this vibrating and is there a fix in the future?

Hello,

  It's been a couple of days since we've heard from you. We're going to assume your question has been answered and close this thread. If you still have questions please feel free to open a new question with us and we will answer your questions accordingly. Thanks!

Actually Andy is one of the most helpful board support personnel people I have I ever encountered along with Miller ...

My guess is since you opened this thread with those specific questions and they have been addressed they follow their moderator rules and mark your question as answered.

The question posed later in thread wasn't really a part of the original post and perhaps could be opened as a separate question thread  and then addressed so that it fits within the parameters of the rules they must follow.

It's easier for us as non-moderators to interject hijacking posts into threads but the Line6 guys have rules to follow so they can't be accused of "wrong-doing" so to speak ..not that you would but someone later not as patient or accommodating might which is why they try to always follow their set support rules. Which makes it looks as if they're picking and choosing a battle when in reality they may just be trying to avoid any question or appearance of hi-jacking a thread which could lead to all manner of unintended consequences.