CAT vs VTL Sound

The VTL 450 & 750 are very different from each other. The 750 is much more dynamic. Check w. some others who use the 750s. I don't know the CAT amps, but I would not consider the 450. By the way VTL is not using the Alexandria, they have the Maxx2s.
My guess is the Siegfrieds are close to the CAT sound & depart from the typical VTL tube sound. You might want to consider Lamms, but your room size is important on this.
PS my 750s image phenomenally well but that is fully realized when used in balanced w. the 7.5 preamp

I have the Wilson 7s w. the VTL 750s. What I have going on is nothing short of incredible. Fly down to Aruba & have a listen. To describe it "the sound is just sick it is so good". I am very happy & can forgoe purchasing the Maxx IIs for a while. I did some tube swapping in my 7.5 which made the images bigger. Not as tall but close in size to the Maxx IIs. No this system plays real music & sounds good. Not just the Audiophile music. To say it such say it all. It is all system synergy & I have it. I really don't know about the CATs. From what I hear the Lamms match great w. the Maxx IIs. But you know what I can jam it out, no loss of power & I like tetrode w. more power over triode. Most audiophiles who hear this system go home trying to find a way to tweak their systems. I waited many years for this. You can't go wrong in truth either way but the 750s are great amps. They do get hot though.

Herer,

Thank you for the compliments. I have learned a lot through experimentation. The VTL 750 does not lack on the WP 7 on the bass at all. As for the match w. the Maxx IIs I myself am left a little confused asking the exact same question as you. I know those who have sold the Siegfried for the ASR gear. He much prefers it. I also know people who prefer the classic VTL sound. Until I can afford the Maxx IIs I am OK. Supposedly the wooofer of the Maxx II is controlled by Lamms w. 18 watts so I don't necessarily agree. But the Siegfried is a fully regulated power supply. I don't like the dynamics for Rock on the 750s in triode only tetrode. I basically use all 800 watts available at times. Then again the Maxx II is more efficient. There is one member who switched out ARC 610s (if I remember correctly) for Lamms. I had my Krell 600 before. Bass was a tiny bit more solid but truly tiny. Body on the VTL is better.

To summarize my feelings in a simple way, we are tunning our system. How you tune it is based on tubes, cartridges, room, equipment. I heard a great tuned setup which I then purchased. I then improved on it at the source. I am still improving w. better tubes. Changing tubes is fun. I can do a lot w. a little money to realy make a big difference in my system.

Would I try CAT on my speakers. No. Simply because my sound is so good & it took me so long to get there. I have what I want based on my priorities. But I would gladly take a solid state amp over a tube amp any day to save the hassle if the sound was the same. It is just very difficult to demo gear to find out. Tubes are work. They produce heat & from time to time a fuse goes. Still the sound is worth it.

Hope I helped, rambling a bit.