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#16
03-15-2009, 11:40 AM
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I agree on the precautionary re-capping... I'll refrain from turning it on until I recap it. I probably got lucky not to blow it up by powering it on the one time for the pictures... I'm glad I quit while still ahead!
And a note on the color fields... I can't explain it either, but also, when I took the photos, I had to take about 25 photos of the screen until I found one that had all 3 colors. Most were either one color, or two with a black band. I also can't hear the horizontal oscillator, which I can hear plainly on most other TVs. I found that strange too.... Charles
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Collecting & restoring TVs in Los Angeles since age 10 
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#17
03-19-2009, 11:31 PM
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It amazes me what these go for. Nice find by the way! You couldn't have found a nicer one. Is the leaking cap problem what makes them so rare? Or, did they not make many? Or both? I would love to have one but the price always scares me away. Maybe I'll get lucky at an estate sale or something.
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My TV page and YouTube channel Kyocera R-661, Yamaha RX-V2200 National Panasonic SA-5800 Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20 Pioneer SX-939, ER-420, SM-B201 Motorola SK77W-2Z tube console McIntosh MC2205, C26 
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#18
03-20-2009, 12:13 AM
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Probably both if you ask me, Mark. These had to be very pricey when they were new! Bet few people would shell over much coin for a portable back then.
 Can't explain the technology employed in the set but what's interesting is that you can't hear the horizontal oscillator whine, Charles...Makes me think there's some type of unusual configuration used there which may just explain the unique technology of the tube (?) Glad you got it, I'm sure it will be in good hands...
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#19
03-20-2009, 06:47 AM
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Hello Charles,
Congratulations on the Indextron, & Welcome! to the club of Beam-Index CRT users. I have the unobtainium full Indextron service manual and schematics. In your mailbox ASAP if you want it. A few pictures: - Dead caps, Andy's picture (Thanks!) all the purple ones leak - Caps changed on ONE of my Indextrons, SAME quantity on unit #2. - The Indextron CRT seen from the gun side. Note how simple the gun structure appears. - Rear view of the KVX-370, open. - ONE Gun = PERFECT convergence! * *see this pix & more here: http://audiokarma.org/forums/showthread.php?t=120906 Best Regards jhalphen Paris/France Last edited by jhalphen; 03-20-2009 at 06:51 AM.
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#20
03-20-2009, 11:50 AM
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Thank you for the pics, Jerome! I haven't taken this one apart. But I just got a rock in my stomach: I remember seeing someone selling 2 Sony small tubes on eBay; of which was supposedly color, but I thought they were both 4" B&W tubes by the photo in the ad. Now looking at you pics, I know what the "color" one was an Indextron
 It sold for $9 new in the box.Your photo of the leaky caps is encouraging... Not so many as I was imagining, and they're thru-hole!!!!! I pictured about 50 surface-mount caps to be replaced. I'll go at it sooner than later  Charles
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Collecting & restoring TVs in Los Angeles since age 10
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#22
03-23-2009, 06:23 AM
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Hi to All,
Charles: i sent you the complete Indextron service data yesterday. Here is a drawing depicting the screen structure of a Beam-Index CRT. This is not the Sony Indextron, but a CRT using similar technology. Best Regards jhalphen Paris/France
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#23
03-24-2009, 10:52 AM
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Thank you Jerome for those!!!! I received them, and will print them out. I especially liked being able to better-understand the indexed scan theory!
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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#24
03-26-2009, 12:19 AM
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Quote:
It did get rid of that PITA convergence chore in manufacturing. Which would cut manufacturing costs. The width of the stripes on your Indextron reminds me of the coarseness of some GE Portacolor CRTs.
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Last edited by wa2ise; 03-26-2009 at 12:23 AM.
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#25
03-26-2009, 11:16 AM
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Quote:
You're not kidding! Charles
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Collecting & restoring TVs in Los Angeles since age 10
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#26
03-26-2009, 03:03 PM
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If the indextron tube is used with a OLCI or deep tinted glass faceplate, the black level issue can be resolved at the cost of overall intensity.
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#27
03-26-2009, 08:48 PM
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Quote:
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#28
03-27-2009, 03:52 AM
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Quote:
Where the issue is here is the Indextron needs a minimum amount of beam current to excite the index phosphor, to provide the feedback to the color switching circuit, keeping the timing in lock. This made the image appear as if the brightness was too high since it also illuminated the other phosphors as well. In the very few industrial aviation indextron displays I saw, they placed OLCI glass in the front of the tube face to darken the background, since the high black level would be a nuisance to the pilots in the aircraft. This had the net effect of as you say cutting the maximum brightness, but the OLCI coating on the glass prevented the glare from sunlight from washing out the picture so it was a favorable tradeoff. These little sets were really pricey when they were new. I remember it was a toss up between one of these, a 8" or a 19" at >$500.
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#29
03-30-2009, 01:50 PM
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Good Day, Gentlemen,
Genuine Sony KVX-370 Indextron screen pictures. Judge for yourself the picture quality... Courtesy John Folsom Jr (FLA), 2008 - Thank You! John I have 3 IndexTrons, operating in Europe via NTSC --> PAL Standards Converter, i can confirm obtaining same pix quality. Best Regards * Some units repaired by Andy, TX, Thank You! Andy jhalphen Paris/France Last edited by jhalphen; 03-30-2009 at 02:02 PM.
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