I also have 275 mk IV and SF Cremona Auditors. While I never listened to the original McIntosh tubes as I bought the amp preowned, I did compare the Valve Art cryo tubes vs. Svetlana SED KT88's. The SED tubes are much more dynamic overall. The Valve Art tubes sounded more like classic tubes with very warm midrange and rolled off highs. The Svetlana SED are very good tubes for the 275mk IV, which in itself is a fantastic tube amp. I also own 501 monoblocks and switch back and forth and enjoy both tremendously.
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