Need advice on tube upgrades for my BAT

I swapped the tubes in my VK60 with upscale audio. big improvement. call 'em...they talk it through with you.

If you don't want to spend a lot of money on exotic upgrades, try NOS Phillips JAN 6922's. They cost less than the stock tubes and sound almost as good as the best exotic NOS tubes. They should be readily available at most reputable tube dealers. Try "www.tubeaudio.com".