Sonus...I've owned the SFCD-1 for several years and have tried many different tubes in it. My two favorites are as follows. A pair of Siemens E188CC / 7308's do a good job of delivering more detail and tighter, well defined bass. They do a pretty decent job of delivering the 'tube sound' you are looking for. My favorite is the Amperex JAN 7308 Orange. They take all of the fine attributes of the Siemens tubes to the next level. I would have to say that Amperex tubes made a 20 - 25% overall improvement over the stock Sovteks. These tubes are somewhat hard to find though and I have heard that this tube is commonly 'faked'. Good luck in your search. I hope you enjoy the SFCD-1 as much as I do.
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