I do NOT think this is a chromatron . WHY would one need convergence for a chromatron? The whole REASON for the chromatron--is to get away from the shadow mask and convergence.....this has a cloverleaf....

I think andy nailed it in an earlier post:

In this design, 3 guns are used rather than applying 3.58 mhz high voltage to the color selection grid near the phosphor.

jr

I had a color G.E. from the early 70s with the anode button on the side like that. But yeah, I can't remember any other color tv that had that type of HV connection.

IIRC the 23EGP22 was the only American color delta gun CRT with a side HV connector.

Could they be using the clover to simply align the three beams into a horizontal line, as well as for geometry?

If it was developmental towards the Trinitron, the second high voltage point might be for the h-stat convergence electrode?

It looks so "un-Sony", but I guess that comes from having never seen a Sony set that wasn't a Trinitron, or anything Sony that was tubed.

There has been a small update to the original post at the original link (unless I missed it the first time, I was having issues getting google translate to load the entire page). It appears a lot of information and possible even a schematic for the related 19C-70 model was published in a special 1967 edition of a Japanese electronics magazine: 電波科学 1967-1

I found this link for an auction selling the magazine: http://page9.auctions.yahoo.co.jp/jp/auction/k149449266

Though getting things from Yahoo auctions Japan from outside of Japan tends to be difficult and expensive.

22EP22 has a side HV connector also.

jr

This is the config. of the 7 inch Sony Chromatron.

[IMG]http://i184.photobucket.com/albums/x...magejpg1-1.jpg[/IMG]

Hi to All,

Dr ido: my friend has purchased the schematics book for me on Yahoo! Japan.

When i receive it, i will scan the interesting pages concerning the Sony 1967 Chromatron.

In the meantime, for those having issues reaching the Blog, here is the full book page + zoomed snapshots of the CRT data contained in the book.
Please bear in mind the original entire photo is only VGA resolution 640x480 and therefore quite poor; Sorry!

Photo credits: N.Tezuka

the Blog:
http://translate.google.de/translate...Fvrc-tezuka%2F

Update: Now 26 photos.

Best Regards

jhalphen
Paris/France

Interesting!

I just started re-watching a video of the repair of a 1979 13" Zenith System 3 and noticed that its CRT has a side HV connector.

Hi to all,

Sept 3rd: Noriyoshi has resumed work on restoration of the Chromatron.

Picture is now in focus and fully covers screen.
Still some work needed on the color decoder - see photos.

http://translate.google.de/translate...Fvrc-tezuka%2F

I have acquired a 1967 Japanese book where there are the schematics of the Sony 19C-90 Chromatron, essentially the same model but in a different cabinet, this one is a floor-standing model.

See the full resolution scans on Marshall's site (Thanks! for posting them).
Scanned as 4 pages to not wreck the book.
Located approx. middle of the very long page.

http://www.visions4.net/journal/chromatron

Best Regards

jhalphen
Paris/France

This has been a very interesting thread to follow. Dr. Lawrence would be proud to see that people care about his Chromatron invention and are working to restore a set made with it some 45 years later!

I also agree very "UnSony" like design, from having looked at Trintron sets all the way form a 1972 12" monitor/receiver to a 2004 34" 16x9 HD set with HDMI.

Now if we could ever find out about those TV's used by PYE for the experimental broadcast of the Coronation back in 1953. there where broad hints that those sets used where of a Chromatron design and has a 21" screen.

Matt

Hi to all,

@Matt, Thanks! and it's not quite finished yet.

For the lazy guys among us who don't have time to roam around the full size scans on Etype2's site with a magnifying glass, here are zoomed illustrations of Sony's 19C-90 in the Japanese 1967 Color TV book.

The Chromatron Noriyoshi is repairing 19C-100 has virtually the same circuitry, but in a tabletop cabinet.

The Chromatron displayed at the Sony Museum in Tokyo is referenced 19C-70 but the schematics book shows model 19C-90.
Their appearance seems totally identical. Anyway, all used the 480AB22 48cm screen diagonal Chromatron CRT.

It is interesting to observe how fast Sony progressed after the three first models (1964-1967) as the all-transistorized* KV-7010U Chromatron with an 8" screen came out in early 1968.

*except for two EHT rectifier tubes.

see E-type2's site: http://www.visions4.net/journal/chromatron

Best Regards

jhalphen
Paris/France

Thanks for sharing this with all of us Jerome.