Homemade Color Wheel TV - Page 4 - Videokarma.org TV - Video

Steve K · #46 01-02-2006, 03:53 PM

Thanks Charles!

I just sent you an email but forgot to put a title on it so don't be afraid to open it, it is a real email from me.

Steve

bgadow · #47 01-04-2006, 01:24 PM

buyonline, great story! That had to have been a thrill to watch something you built from scratch delivering a color picture. I hope you can share pics when its operational again.

#48 01-10-2006, 01:03 AM

Quote:

Originally Posted by Dave A

I have my Col-R-Tel up and running on a Philco 12" although the CRT is not great. The picture is a very rich CT100-like color and can be saturated right off the dial. And full hue control to boot.

There is a noticable flicker that dulls down the more you watch it, but the most objectionable thing is the artifacts in the picture from the conversion process. Crawling stuff everywhere. And the resolution drops like a stone. Small graphics are tough to read.

Now if anyone has a spare 12KP4, I would like to buy it and be able to get a better picture so I could post some photos.

Dave

Hi Dave, have you tried using an old CRT "booster" (small 60-Hz transformer with socket in for CRT cable and socket out for CRT) that raised the filament voltage on the 12KP4? How about using a CRT rejuvenator such as B-K Precision made "back when"?

Dave A · #49 01-10-2006, 10:21 AM

Yep, been there, done that. The thing is just a goner...and I missed the 12KP4 last week on ebay. Drat.

Dave A

#50 01-30-2006, 03:02 AM

I just found this thread and it brought back some memories. Back in the mid 70's I believe it was, Popular Science ran an article on the color wheel principle but instead of using a spinning wheel it used a conveyor belt like film of plastic mounted vertically between two rollers and imprinted with RYB striping, in the middle between the two spinning rollers and the film was a another clear glass or plastic sheet with the b&w diagonal striping. Does anyone else recall this ?

Steve K · #51 01-30-2006, 08:56 AM

Pete:

Yes, I remembered that article very well and finally found a copy of it. That method used only two colors and was being produced by a Canadian firm. I do not believe that any ever came on the market however. I am not home right now otherwise I would include the issue month and date of that article. It was in Popular Science.

Steve