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I bought four TunSol KT120's from a gentleman on another forum (ahem), tried them in my Primaluna and the were just as described in many places. Big and powerful low end and even handed throughout the balance of the frequency range. It was an experiment in tube rolling. I have since gone to the KT-88 Gold Lions and prefer them with my Spendors. I could see the KT-120's being a great match with horns, warm and powerful.
They sound great, but I don't have any test gear so I can tell you they worked perfectly in my amp.
Asking $110 shipped anywhere in North America, PayPal fees covered by me.