i just got a tube cube earlier this week and setup a new system for my home office, small room 10x10ft. using with a klipsch premiere 150s and a 12" SVS sealed sub. it has plenty of volume and power and exceeds my expectations in terms of sound. given its my first tube amp not sure how its supposed to sound or how much better other more expensive amps would sound. i did order a mullard 12ax7 and sovtek el84s and despite trying different combinations can't tell a major difference between the different arrangements! it's also only been used for about 7 hours so far so maybe the tubes need to burn in... since my ears cant tell the difference rolling the tubes (at least not yet), is it even worth considering more expensive and powerful tube amps? my budget was to stay under $1k for the amp. i was originally looking at a kingko amp, but was concerned about resale value and also lack of reviews. so as i was about to get a primaluna prologue 4 i came across the tubecube and bought it. now that i've been doing more research people seem to also be happy with the olchen amp. for those whove used the tubecube as well as other larger tube amps what are your thoughts? i guess my main question is will i notice an obvious difference in sound quality upgrading the tube amp.