The $2 VCR special today

[Electronic M]

A needle change will NOT affect stereo/mono operation in a stereo machine. The "audio (mono and stereo)" and "video" at the stylus are in the form of modulated RF carriers. The circuits in a mono unit simply ignore/ are unable to do anything with the stereo carrier where as a stereo player has the extra circuits for the stereo carrier. It's completely analog though so dude's analog fetish is not being corrupted in stereo models.

Stereo discs are in blue caddies, monophonic discs are in white caddies, and interactive discs (which play as a jumble of random scenes without an interactive player) come in black caddies. Mono and stereo disks will play on any type of CED player the same way mono or stereo FM radio will play on any type of FM radio.