A power supply's rectifier(and it's quality) is VERY important to the sound of any amplifying circuit(phono, mic, preamp, power amp, etc). Anyone that has taken the time to install, say a Mullard Blackburn GZ34/5AR4, in the place of most other tube rectifiers(of the same family), or Fast/Soft Recovery Epitaxial Diodes, in the place of standard SS rectifiers, will likely attest to the improvements of presentation(across the board). Generally speaking; the sound will open up, have greater dynamics and a smoother(less grainy) high end. What you are listening to, through your speakers IS(in actuality) your house current, as prepared by your power supply. Your speakers are connected to your power supply, through your output devices(tubed or SS), and the DC output of said power supply is modulated(YES- the correct term) by those devices(basically switches), as directed by the musical signal. Is that the WHOLE story? NO! Every gain stage is important. Phase splitters and driver tubes BOTH contribute tremendously to one's final sound. BUT- to ignore the importance of the power supply's rectifiers, is to rob yourself of MUCH musical pleasure. I didn't stay at a Holiday Inn, but I have been modding audio equipment, and pro gear, for over 30 years and have made many a discerning ear happy, in that time.