Just a follow-up...
Depending on the taste of your music! You can install a Genalex original $500.00 per tube and it might not suit your taste. On my amp I like putting real strong tube. (I don’t like burn-in tubes). Some of them tend to loosen up the tone. Sounds like an off dialed 60’s tube amp weak power. There are such times I use a quad of PSVANE KT-88 I and listen to classic pops and some jazz. The bass in thundering with excellent highs. When I’m downstairs I can hear it pounding, but when I’m in front of the music room its not loud. the time I found the matching speaker for my amp with sound I’m looking for, even if I switch to a brand new genalex, there will be a change, but its not gonna be dramatic. irregardless if your speaker is high definition, Its all about using the correct speaker wattage to match your amp. If you can achieve that, Its like an open gate to a new world. Otherwise it’ll be an endless buying of different tubes, to amps, then to preamps etc..