KTEH

Background
KTEH was a PBS affiliate located in San Jose, California that became KQEH (KQED Plus) in 2011.

1st Logo (1977-1983?)
Visuals: On a black background, sparks draw in many circuit lines, each in pairs of three with there pairs from the top and three  pairs from the bottom. They then draw in several different directions, but ultimately go towards the center of the screen to wipe in the text "Impact" in a font similar to the WDVM/WUSA logo at the time, from both areas at the same time. As the sparks go off of the logo, the logo glows furiously, eventually causing the sparks to fade out and changing the text to amber. Below the logo is "SAN JOSE" and above it is either "A PRESENTATION OF" or "A PRODUCTION OF" in a font similar to Microgramma.

Technique: Motion-controlled animation.

Audio: A cool Moog synthesizer jingle. However, when used as an end tag for a sign-off promo, it has some soft harpsichord music.

Availability: Seen on some KTEH-produced shows from the period and on a sign-off from the station.

2nd Logo (19??-1988)
Visuals: On a black background, the text "Impact" is seen with a shine and in a custom, angular font much like the previous logo. Below it is "SAN JOSE", also in gold and in a curvier font. All of this is near the top of the screen, with "" in Eurostile near the bottom. The logo fades in and out.

Technique: Fading effects.

Audio: None, though it could use the same synth jingle used by WIPB and WPSX. If so, then this logo would be the first to use that jingle.

Availability: It was found by two users, but the first to do so made it a Rickroll. It might have appeared on KTEH programming at the time.

3rd Logo (1987-1993)
Visuals: On a background, the text "Impact" is seen in a font similar to the previous logo, but modified again. Below it is the text "Times New Roman" in a fancy cursive font and above it is "A presentation of". The entire logo is black at first, but a white bar wipes through the text and stops near the bottom of it, fully coloring "Times New Roman" and part of "Impact" in white.

Variant: On Silicon Valley, the bar goes from left to right and the text above says "A production of", either with or without a capital P. The number "Impact" may also be seen.

Technique: 2D animation.

Audio: None or the opening theme of the program. The sign-off variant male announcer saying This is public television station KTEH, San Jose, California, now concluding its broadcast day. KTEH is licensed to the KTEH Foundation and transmits on channel 54 from Monument Peak. Our general offices are located at 100 Skyport Drive in San Jose. KTEH programs are rebroadcast on translator station K52BR, serving the Gilroy/San Martin area.

Availability: Seen on Pet Pourri, Silicon Valley, and Kids' Clubhouse. Surprisingly on a sign-off station.

4th Logo (1993-2008)
Visuals: On a black background, the white letters "KTeH" rotate in one by one, with a square appearing behind them. The colors are blue,, , and purple respectively, and the "e" is slightly tilted. Below, "SAN JOSE PUBLIC TELEVISION" fades in below in an Art Deco font.

Variants:
 * There is a variant with "In Association With" on top of the logo, of which fades out before the logo fully forms.
 * On late-1990s episodes of The Computer Chronicles, the logo is inside a Netscape Navigator window with a background reading the show's title, and "Produced in Association with" is above the logo. The variant is made to resemble a web page from the time.

Technique: 2D computer animation.

Audio: A twinkling synthesizer and chimes tune, actually a track named "Maiden Flight" from the Network Music "Brainstorm 5 - Audio Logos" CD. It has 2 versions, one having the full jingle, and a short version that begins with the 5 chime notes and fades out early. Otherwise, it uses the opening theme or silence.

Availability: Seen on Uncommon Knowledge and The Adventures of Kanga Roddy.