Amp vs preamp question

I see no inconsistency in most of the arguments above. I'm in the "garbage in, garbage out" camp. So I view the pre-amp as being more important than the amp. This presumes, however, all other things being equal. The amp has to mate well with the speakers and the system has to be tuned for the room, or vice versa. So if you have an amp that is suited for the speakers, and if your room acoustics are good, then all things are equal and a preamp upgrade should do more for you than an amp upgrade.

Thank you very much for your help
I am thinking about BAT vk 51se preamp and Rogue Audio Zeus Amp

Can you give me some more advice?

The Thiel 3.7's drop to 2.8 Ohms, very few tube amps are at their most comfortable operating into such a load.

I'm not a Thiel guru, but it sounds like tube amps are not a good match to the Thiels due to difficult load.

You might be better off going SS on the amp and tubes on the pre-amp, if that's the sound you like. The SS amp should double power to 4 and 2 ohms as discussed above due to the load.

I'm sure others may have some specific suggestions regarding what works good with Thiels. If it were me, I'd consider some of the better Musical Fidelity amps of perhaps something Class D, like Bel Canto or Rowland maybe.

A Friend of a friend of mine owns the 7 series Thiels, and has put in place several differring amps, as is my understanding. Krell, Ayre, BAT, and I think a Classe. I'm pretty sure a few Tube amps as well. Last I heard he liked both the BAT vk500 and an Ayre, (the model escapes me now).

I feel as I said above, the speakers will narrow the field by it's own demands.

Impedance curve, efficiency, and freq range. With thiels, I'd venture that SS power would be by far the safer bet for an amp with Theils in the picture. Overall.

There likely are tube amps which will satisfy too.... depending again, on what it is you are looking for ultimately.

The BAT vk51SE is a solid preamp. Great build and some flexibility, and great support. Lots of tubes though... but with SE & XLR output, that should allow a greater field of amps to select from. Keeping built in sysnergy in mind, a pretty safe bet I'd say would be to go BAT amp too.

Given BAT's rep for power resivoirs if a vk51 is likely to be your preamp choice, you could do worse than adding a BAT SS amp. I sure wish I had my VK 500 still.

Whatever the pick... good luck.