Montejay is correct, a lot of stereo recordings in this era were mixed with hard panning. Rock music from the early era of stereo is notorious for this stuff, the reason I generally prefer mono recordings from this era.
I suspect some of the sparkle your speaking of is air around images, stereo is often more spacious/airy sounding than mono with it's more tightly bunched images. You also lose a lot playing stereo recordings in mono, artificial mono produces strange effects.
I suspect some of the sparkle your speaking of is air around images, stereo is often more spacious/airy sounding than mono with it's more tightly bunched images. You also lose a lot playing stereo recordings in mono, artificial mono produces strange effects.