Bwarfel, what were you favorite tubes with your Cary F1? I just bought a brand new stock SLI-80 with factory Electro-Harmonix tubes. I have ordered a few tubes that are burning in as we speak. So far I have bought...
NOS Mullard 6DJ8/6922's (A-frames, Blackburn factory code)
NOS Sylvania 6SN7WGTA (brown base Navy issued)
NOS Phillips 5AR4GYS rectifiers
Havn't replaced the output tubes yet, and still not sure about my current NOS tubes as they are still burning in. I am curious what tubes other SLI-80 owners have chosen and come to prefer.
To the original poster, I have not heard the Quicksilver Monos, but I can say the Cary is really impressive to my ears. I have no regrets whatsoever, and don't think you will go wrong with choosing Cary products, especially the SLI-80. FYI, my prior system was vintage Mcintosh solid state. It was really nice, but I was bitten by the tube bug.