Interesting note Rlf! I love my 3.8s with an ARC D250mkII, brute tube power. Can be scary at times!
However there is certainly a cheap alternative to try out tubes on your gear. I'd look into a second (or third) hand D125 on your 2.5's and enjoy.
However there is certainly a cheap alternative to try out tubes on your gear. I'd look into a second (or third) hand D125 on your 2.5's and enjoy.