Papi_chulo,
I own the 300XSE amp, and I can assure you it won't sound shrill or overly bright, as long as you partner it with the right speaker cable and interconnects. I use Audience AU24 throughout my system, which includes a Magnum Dynalab MD-102 tuner, and an Electrocompaniet DAC (linked to a Philips 963 DVD/SACD player) all feeding into a pair of Tyler Acoustics Linbrook Signature floorstanders - the sound is gorgeous (especially with the tuner on good FM stations) - very layered, almost so dense you feel like you're walking among the band members if you can force yourself from the sweet spot :) Stick with the super tubes - they won't let you down. Regarding your question about replacing the tubes, an alen wrench is provided with the amp, and the two tubes are easily removed (remember to avoid touching them with your bare hands). Good luck.
I own the 300XSE amp, and I can assure you it won't sound shrill or overly bright, as long as you partner it with the right speaker cable and interconnects. I use Audience AU24 throughout my system, which includes a Magnum Dynalab MD-102 tuner, and an Electrocompaniet DAC (linked to a Philips 963 DVD/SACD player) all feeding into a pair of Tyler Acoustics Linbrook Signature floorstanders - the sound is gorgeous (especially with the tuner on good FM stations) - very layered, almost so dense you feel like you're walking among the band members if you can force yourself from the sweet spot :) Stick with the super tubes - they won't let you down. Regarding your question about replacing the tubes, an alen wrench is provided with the amp, and the two tubes are easily removed (remember to avoid touching them with your bare hands). Good luck.