Why limit yourself to the KT-150 tube? There are so many great sounding amps that use other type tubes. BTW, Tung-Sol is the only manufacturer that makes that tube. You are boxing yourself in with one brand of tube!
I know you stated KT 150s, but IF you might consider KT 120s, then check out Rogue Audio's Cronus Magnum III which has had several significant upgrades from the Mag II. Made right here in Northeast Pennsylvania for just under $3000.00
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