I had these in house,while waiting for my Air Tight ATM-3s.Very musical and dynamic,but not the last word in down-to-the-noise-floor resolution.That said,they were enjoyable and very dependable,with a musical harmonic structure.
The ATMs were very much a midrangy affair,though they did mate with the Yankee FPR 72s very synergistically.The Siemens EL-34s were a must in that amp,not the AEGs.Better drive in UL,but lost that beautiful midrange lushiness.Resale is terrible.Alot of picking a tube amp has to do with the speaker being driven-planar,dynamic or electrostatic.What speakers will you be mating up to the "future tubes"?
You might want to audition the PrimaLuna KT-88 monos.I would definitely upgrade the input and driver tubes,along with an after-market PC.Check their audition policy,don't know if there is a re-stock charge.For $2700,the other upgrades might leave some leftover cash for music.
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