Logo: Just the word "NBC" in a microphone, surrounded by bolts of lightning.
FX: None.
Music/Sounds: TBA
Availability: Extinct on TV.
Scare Factor: None.
2nd Logo (1950s-1960s?)
Logo: We see the words "NBC" surrounded by a square zoom up on a gray BG. The letters light up one by one as the NBC chimes sound.
FX: The zooming, the letters lighting up.
Music/Sounds: An announcer saying "NBC Television.", followed by the famous "NBC chimes" (the notes G, E, and C) as the letters light up.
Availability: Extinct on TV.
Scare Factor: Minimal.
3rd Logo (1976-1977)
Logo: On a black BG, we see a stylized N composed of two white trapezoids zoom out. A couple of seconds later, they get filled with color; the left trapezoid turns red, and the blue one turns blue. "NBC" appears in the bottom right corner of the N.
FX: The Scanimate effects, which were done by Dolphin Productions.
Music/Sounds: A big band tune with bongos.
Availability: Extinct on TV.
Scare Factor: Low.
4th Logo (1982-1983)
Logo:
FX:
Music/Sounds:
Availability:
Scare Factor:
5th Logo (1986-1990s)
Logo: Exactly like the 1986 NBC Productions logo, but slowed down and missing the word "PRODUCTIONS".
FX: All of the animation.
Music/Sounds: A Broadway-sounding tune, with the NBC chimes near the end.
Availability: Long gone from TV; check any old tapes you have!
Scare Factor: None, really.
5th Logo (1993-1999)
Nickname: "The Fireflies"
Logo: We see a rush of white "fireflies" (what they are referred to from now on). The fireflies eventually take on the six primary colors, and transform into the NBC peacock. When the peacock is formed, white fireflies continue to fly around in the background.
FX: The animation of the fireflies, which still holds up today.
Music/Sounds: A rather tranquil symphonic theme with backing that sounds a bit like the NBC peacock theme from the '60s.
Availability: Again, it's gone from TV. However, given its long lifespan (it served in various capacities during the '90s, such as a network ID or serving as NBC's "special presentation" ID) you might see it on tape somewhere. Another capacity it served was to signal the switch of Philadelphia's WCAU from CBS to NBC in the early hours of September 10, 1995.
Scare Factor: Low; the start of the ID may catch you off-guard, but this is a magnificently well-done ID.