Repair Blog of a 1967 Sony Chromatron

[jhalphen]

Hi to all,

Exciting stuff!

First internal/external photos ever of a 1967 Sony Chromatron color TV.
17 photos so far. Seems to be an all-tube chassis.

The Sony 19C-100 belonging to the Japan Radio Museum has been entrusted to Japanese friend N. Tezuka to make it work again.

Follow the endeavour by reading his blog:

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

Please keep in mind that Google's Japanese to English translation is, well "creative".

Later day update from info received from Japan:

CRT diagonal is 480mm/19"
CRT type is 480AB22
2x EHT rectifiers used: 1 for HV and another 1 for MV* (6.3KV) and FV* (4.1KV).
Also thinks it's a 3 gun tube, therefore not a true Chromatron.

*MV: Medium High Voltage
*FV: Focus Voltage

The Sony Museum Chromatron TV is a 19C-70 and this one is a 19C-100, therefore a new unidentified model with a smaller screen.

Best Regards

jhalphen
Paris/France

[JBL GUY]

Very interesting.

Thank you for the link.

[Sandy G]

Jerome, I DON'T know where you find all this stuff, but I'm VERY glad you do, & that you selflessly always share it w/us !

[jr_tech]

Cool! Thanks for posting!
I don't get why they would be using what looks to be a delta gun in a Chromatron design... very strange!

jr

[jbattles]

It sure looks like a delta gun to me. A lot is lost in translation. You can see it the picture. It would be neat to find one the us a tube Sony would be cool, but it would way 5 tons and would have to use o.e.m tubes from Sony.

[Jon A.]

Even if it's not a true Chromatron, a delta-gun Sony must be quite a rarity in itself.

Holy frig, 330 watts for a 19" set? That's quite the power suck.

[colorfixer]

The convergence clover gives an indication of a delta gun, but notice the close-up of the tube face that shows the phosphor stripes.

There are two high voltage connections on the bell: take a close look at the photo that shows the rear of the tube, there is a high voltage lead on the left of the tube, and a smaller one on the right!

[Jon A.]

So much for a CRT sub for one of those.

[Sandy G]

I remember seeing a Sony color set & BIG-@zz VCR on an audio-visual type roll-around cart-The metal kind schools used, prolly 1968-'69, but the TV was NOT a Trinitron... Looked more like a Zenith or RCA table model, was about 19-23" whatever they usually were. This was at Bondurant Bros. Co. in Knoxville, they were the Sony distributors for Knoxville & environs back then. I DON'T think Sony ever re-badged somebody else's sets, at least not in the "Consumer" line, but MAYBE they did in the A/V business... Anybody got any ideers ?!?

[dieseljeep]

Originally Posted by Sandy G

I remember seeing a Sony color set & BIG-@zz VCR on an audio-visual type roll-around cart-The metal kind schools used, prolly 1968-'69, but the TV was NOT a Trinitron... Looked more like a Zenith or RCA table model, was about 19-23" whatever they usually were. This was at Bondurant Bros. Co. in Knoxville, they were the Sony distributors for Knoxville & environs back then. I DON'T think Sony ever re-badged somebody else's sets, at least not in the "Consumer" line, but MAYBE they did in the A/V business... Anybody got any ideers ?!?

I the early days of B/W, R-R Sony VTR's, Sony had Motorola build a 23" B/W monitor with the input connector for their VTR.
That was in the mid-60's.
The set was badged "Sony", but it was obviously a Motorola.

[Electronic M]

Originally Posted by Sandy G

I remember seeing a Sony color set & BIG-@zz VCR on an audio-visual type roll-around cart-The metal kind schools used, prolly 1968-'69, but the TV was NOT a Trinitron... Looked more like a Zenith or RCA table model, was about 19-23" whatever they usually were. This was at Bondurant Bros. Co. in Knoxville, they were the Sony distributors for Knoxville & environs back then. I DON'T think Sony ever re-badged somebody else's sets, at least not in the "Consumer" line, but MAYBE they did in the A/V business... Anybody got any ideers ?!?

I have a Setchell Carlson tube color monitor with Sony badging. http://videokarma.org/showthread.php...tchell+Carlson It probably was made as an accessory or a trade show monitor for some early tape or camera gear.

[andy]

...

[jr_tech]

I think andy nailed it in an earlier post:

Originally Posted by andy

It's probably similar to the 7" Chromatron except that it has a delta gun instead of a Trinitron gun. In the 7", the color selection grid is powered by DC and serves basically as a lenticular lens to focus the beams on the appropriate color stripes. The advantage is that no electrons are wasted, but it's a lot more complicated to manufacture.

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

jr

[zenith2134]

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.

[Jon A.]

Notice the neck too, looks delta to me.