BAT vs. Quicksilver

Although both are excellent products, I would probably choose the Quicksilver because of it's ability to accept a wide range of tubes.

The BAT VK-60 is capable of running ONLY the 6C33C output tube (which I dislike) and the Quicksilver is capable of using KT88, 6550, 6L6 and EL34.

The EL34 and 6L6's are at the top of my all time favorite list with KT 88 and 6550 not far behind. There are lots of choices, with both NOS and current manufacturers offering a wide range of choices in glass, making it easy to "tune" to your speakers, power needs and personal preferences.

I will admit that the driver circuit of the BAT is potentially superior with it's multiple octals, and if you really want more power, the KT88 is the likely candidate for the Quicksilver as it produces the most power.

Any chance of hearing the Quicksilver before deciding on a swap?

unfortunately there aren't any Quicksilvers locally that I could hear. I would keep the BAT & audition the Quicksilvers. Whichever one I liked better I would keep.

There is a QS on sale today by seller thatpreviously owned by a BAT-VK-60 owner. You might be able to speak with him/her.