Admiral 24A12 tuneup p6o6 (finale)

Here's the final installment of this project. I clean up the cabinet, reinstall the chassis and do some final tests.

Category:

Howto & Style

Tags:

• admiral
• 24A12
• vintage
• antique
• television
• restoration
• repair

[Jamiep84]

I believe that later monochrome sets (made after colour broadcasts were introduced) had a "chroma notch" filter, to prevent chroma dots appearing on-screen.

[bandersentv]

@Jamiep84 I think you're right.

[vwestlife]

The amazing thing about those "chroma dots" is that engineers have made a computer algorithm to analyze the pattern of the dots and use it to recreate and decode the color signal. Using this method, they were able to reproduce true color versions of old TV shows which were originally broadcast in color but for which only black & white kinescope copies existed (movie films made by aiming the camera at the CRT of a black & white TV receiver).

[bandersentv]

@vwestlife I was watching some Dr Who recently from the John Pertwee era (3rd Doctor). It was called 'The Ambassadors of Death' and they lost the original color videos long ago.  Some segments had been colorized using the process you described. They looked OK, but not quite right.

[bandersentv]

@bandersentv “It seemed almost impossible,” ... “But when they made the black-and-white recordings, they didn’t filter off the colour carrier [encoded as a 'chroma dot' pattern in each frame], which for the last few decades has been nothing more than an annoyance.” Team member Richard Russell used the signal to reverse-engineer raw colour pictures that could be retouched frame by frame. “It’s very, very labour intensive — several hundred man hours’ work every episode,” says Roberts.

[grassulo]

you can also use just the luminance pins of an S-video output to get the same effect, your RF modulator may even have S-video you can get that off of too, hope that helps.

[bandersentv]

@grassulo Thanks for the tip. Some of my equipment supports s-video. I'll do some more experimenting.

[mukerjea]

Excellent restoration Bob. Congrats!

[bandersentv]

@FelixTheHouseFreak Ghost in the Shell Stand Alone Complex 2nd Gig. It's a TV series based on the movie.