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-   -   Admiral 24A12 restoration (http://www.videokarma.org/showthread.php?t=246875)

bandersen 01-28-2011 10:40 PM

The Nixer posted this comment on my Flickr page and I thought I'd share it here.
It's been years since I saw this movie and certainly didn't notice the Admiral at the time. Very cool to see one in action in a movie I think.

Quote:

You may have already seen this but I was watching La Bamba last night and was extremely happy to see an Admiral bakelite console in Ritchie's Mom's house.

The TV would be about 10 years old in the movie. There were also some other neat TV's. Bottom right looks like a Motorola console and bottom left looks like a neat looking portable Zenith. I freaked when I saw the Admiral though. I'd love to know if it appears in any other movies.

You can see the clip here, it's at the 6:29 mark. You see all the TV's within a matter of moments.

bandersen 04-10-2011 10:43 PM

I recently pulled this set out for a little tuneup and thought I'd update this thread.

First off, that rubber to metal cement really did the trick. All four mounts are very securely attached now.
http://farm6.static.flickr.com/5028/...74c49d84_z.jpg

Next up, I removed the rust from the back, polished it up and clear coated it.
http://farm5.static.flickr.com/4111/...763c2f2c_z.jpg http://farm5.static.flickr.com/4095/...ef6238bd_z.jpg

Then, I polished up the faceplate with Novus 1 & 2. I also attached a new foam surround with a little contact cement. I used it sparingly and had no problems with it attacking the old plastic.
http://farm5.static.flickr.com/4096/...1fb68d1b_z.jpg

I also finally got around to cleaning up all the grillework. That grille cloth has really faded.
It looks like the original color was green ?
http://farm6.static.flickr.com/5145/...583f23a0_z.jpg http://farm6.static.flickr.com/5143/...37433710_z.jpg

Here it is all back together.
Ihttp://farm6.static.flickr.com/5262/...e905c19e_z.jpg

bandersen 04-10-2011 10:54 PM

While I had the chassis out, I also replaced most of the tubes in the tuner and IF and did a full alignment. It made a big difference in the picture quality.
http://farm6.static.flickr.com/5186/...194a9d3e4e.jpg http://farm6.static.flickr.com/5139/...7297bb7989.jpg

Here's a multi-burst test pattern. The bands on the far right are 4.2 MHZ and just barely discernible. The B&K 1077B test pattern looks pretty good too :)
http://farm6.static.flickr.com/5185/...a1f8622256.jpg http://farm6.static.flickr.com/5147/...8afbb09a16.jpg http://farm6.static.flickr.com/5187/...c3ebac92da.jpg

There's just one problem. Now, I'm seeing what i believe are called 'chroma dots'. I recall reading a tip about using the green component output of a DVD player fed into an RF modulator. I tried that and it definitely did the trick.

Does anyone know any other tricks to reduce or eliminate them ?
http://farm6.static.flickr.com/5270/...e1e8cd4001.jpg

miniman82 04-10-2011 11:37 PM

If you have a DVD player that has component output, hook the Y line into the set right after the detector. You won't believe the difference!

Barring that (you don't get sound unless you hack the audio section as well), you'll need to filter out the 3.58 info to get rid of the dots. It's really bad on a Philco-Ford set I just got (which is color but still suffers), the dot crawl is atrocious. I don't think it properly filters out all the info for the chroma section, there's obviously still 3.58 in the luma. Some kind of tuned trap is what you'd need, good luck with that.

I've been toying with the idea of feeding the Y and audio lines right into my Magnavox modulator, and feeding the TV with that on channel 3. Maybe you can do something similar?

bandersen 04-11-2011 12:16 AM

Quote:

Originally Posted by miniman82 (Post 3000405)
If you have a DVD player that has component output, hook the Y line into the set right after the detector. You won't believe the difference!

Barring that (you don't get sound unless you hack the audio section as well), you'll need to filter out the 3.58 info to get rid of the dots. It's really bad on a Philco-Ford set I just got (which is color but still suffers), the dot crawl is atrocious. I don't think it properly filters out all the info for the chroma section, there's obviously still 3.58 in the luma. Some kind of tuned trap is what you'd need, good luck with that.

I've been toying with the idea of feeding the Y and audio lines right into my Magnavox modulator, and feeding the TV with that on channel 3. Maybe you can do something similar?

It tried the green component output of my DVD player into an RF modulator and it works quite well.
Too bad my DTV receivers only has RF and composite output. My cheapo Comcast box is even worse - it only has RF output. I generally use a Blonder Tongue agile modulator to broadcast to my sets and they only take composite video.
I suppose I could try a 3.58 MHz notch filter like this: http://www.allenavionics.com/LC_F/NTSC.htm

charokeeroad 04-11-2011 10:18 AM

Watched all eight videos on the restoration of this set. I learned a lot but still don't feel ready to do a restoration yet. For the time being I'm just collecting as many interesting sets as I have room for.

Kevin Kuehn 04-11-2011 11:51 AM

Viry nice work, I wish I had half your ambition.

It looks like those chroma dots are not really visible from a normal viewing distance? That set now has an incredibly sharp picture. Maybe you've gone and done "too good" of an alignment. In other words you could mess it up a little. :D

Kevin

wa2ise 04-11-2011 12:13 PM

Quote:

Originally Posted by bandersen (Post 3000398)

There's just one problem. Now, I'm seeing what i believe are called 'chroma dots'. I recall reading a tip about using the green component output of a DVD player fed into an RF modulator. I tried that and it definitely did the trick.

Does anyone know any other tricks to reduce or eliminate them ?
http://farm6.static.flickr.com/5270/...e1e8cd4001.jpg

I modified my Channel master CM7000 box to only feed the luma and not chroma to its RF modulator.
http://www.videokarma.org/attachment...2&d=1273091337
http://www.videokarma.org/attachment...1&d=1273091337
This box uses a special group delay filter on the video signal to condition it for TV set reception, just like real TV stations did back in the old analog NTSC days. Si it should produce really good pictures on your set, it does on mine.

bandersen 04-11-2011 12:34 PM

Quote:

Originally Posted by Kevin Kuehn (Post 3000441)
Viry nice work, I wish I had half your ambition.

It looks like those chroma dots are not really visible from a normal viewing distance? That set now has an incredibly sharp picture. Maybe you've gone and done "too good" of an alignment. In other words you could mess it up a little. :D

Kevin

Thanks. No, it's not really visible at normal distance. Making the focus a little fuzzy helps too. It also blends the horizontal scan lines and makes a more natural looking picture.


Quote:

Originally Posted by wa2ise (Post 3000443)
I modified my Channel master CM7000 box to only feed the luma and not chroma to its RF modulator.
...
This box uses a special group delay filter on the video signal to condition it for TV set reception, just like real TV stations did back in the old analog NTSC days. Si it should produce really good pictures on your set, it does on mine.

Cool. If I can get my hands on this model, I'll give it a try.

old_tv_nut 04-11-2011 12:47 PM

Quote:

Originally Posted by miniman82 (Post 3000405)
you'll need to filter out the 3.58 info to get rid of the dots. It's really bad on a Philco-Ford set I just got (which is color but still suffers), the dot crawl is atrocious. I don't think it properly filters out all the info for the chroma section, there's obviously still 3.58 in the luma.

There should be an adjustable (tuned coil) 3.58 trap somewhere in that set. (The CTC-5 Super chassis didn't need one because the luma response was so strongly rolled off already.) Excess 3.58 dots desaturate the color, so you do need to fix that for best picture.


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