your most memorable component


what component, other than a speaker, has contributed to the greatest change in the sound of your stereo system ?

what was the nature of the change ?
mrtennis
Quicksilver 300B SET prototype mono amps - I'd never known that kind of seductive presence, and dimension where the music becomes almost tactile.

Marco
Sony SCD-1 modded in Frankenstein's lab with 210 amp-hours of battery power, transformer output stage, and the new Audiocom Superclock 4. The far corner of the soundstage is on the sidewalk outside the house.
My first tubed preamp, an Air Tight ATC-1, I never knew at the time that a preamp was so important. Now I'll never go back to ss for a preamp.