Inasmuch as our Fet Valve 600R has ten times the power of the Ultravalve and has even better audio channel isolation from each other due to multiple regulated power supplies, it should not be a surprise the the 600R throws a big, wide, deep image. By far the better choice unless you are using very efficient speakers. And unfortunately the Ultravalve is out of production right now due to parts shortages.
Even a better choice would be a pair of our M225 mono amps, which everyone reports astonishment with their amazing imaging capability. Something you have to hear to believe.
I have a pair running in my two channel HT system right now just using the smart TV's stereo headphone outputs into an older Vision solid state preamplifier to our new R2X converter box to interface with the M225 amplifiers driving a several year old pair of Salk HT2 TL speakers.
I get an astonishing image now (width, depth, and height) with just exquisite overall musicality, transparency and resolving capability. Probably better then any multichannel HT system you have ever heard.
The M225 is just magic! Yes, source is TV sound from Utube music videos, old solid state preamp, A2D interface, older Salk speakers, and the MAGIC M225 amplifiers. You can't possibly believe what I am reporting until you hear it.
If you are close to the Twin Cities area, come to visit us and become a believer. Call first 651-330-9871.
Frank