Anybody still looking for a Sony Indextron?

[Richard D]

Of course it does not work, but if it did there would be no challenge.
Richard.
http://cgi.ebay.com/ws/eBayISAPI.dll...tchlink:top:us

[rca2000]

And stick with my vidimagic, which also has an indextron tube...works..and was free!!

[Eric H]

Sheesh, he's changed the BIN price like 4 times now!

[Richard D]

I think this gentleman better check his medication level. $500.00 buy-it-now with no box, no paper and not working, a very expensive paper weight.

[Sandy G]

What was the deal on these things, anyways? Some sort of funky CRT ? Super hi-tech electronics that worked on paper but not in the field? Didn't Sony try to recall all of 'em? What time frame are we talkin about, when were they made ?

[andy]

They're from the mid to late 80's and they use a single gun color CRT. Instead of a shadow mask, the single gun rapidly switches between red green and blue as the spot passes over the phosphor stripes. There's a 4th "index" stripe on the inside of the screen that's used to sync the switching to the RGB stripes. There's a light sensor behind the CRT that picks this up. This is the same idea as the Philco "Apple" CRT from the 50's.

I don't know about the general reliability, but the one I saw was full of leaking caps. A full recap probably would have turned it into a reliable TV.

[Sandy G]

Hmmmm....Kinda sounds like Sony was tryin' to re-invent the wheel...What would be the advantages of such a beast ? Looks to me like they had a pretty good thing w/the Trinitron...and in '89, certainly, the LCD & plasma displays were well on their way...Apparently, nobody in Sony had ever heard the phrase-"Leave well enough alone..."

[trinescope]

Why do these things bring such high prices? Looks like a pretty non-descript TV to me, and, from what I read here, not a particularly great performing set either.

[rca2000]

Originally Posted by andy

They're from the mid to late 80's and they use a single gun color CRT. Instead of a shadow mask, the single gun rapidly switches between red green and blue as the spot passes over the phosphor stripes. There's a 4th "index" stripe on the inside of the screen that's used to sync the switching to the RGB stripes. There's a light sensor behind the CRT that picks this up. This is the same idea as the Philco "Apple" CRT from the 50's.

.

Not exactly the same as the apple.

The indextron is guided by a SEPERATE, GREEN phospor, which is BEHIND the main one. The index phospor is laid out so that it will tell the optical sensors on each side of the tube bell where the beam is at any given instant. Ther eis(in my vidimagic projector, anyway) a LARGE ckt. (proably about 5x7")board with a bunch of SSI ic's, that takes this information and then uses it to control the switching of the one single large gun on the tube.

In the original Apple, I do NOT think they used a phospor for guidance. IIRC, there were two anode potentials and an index "stripe" of aluminum behind each trio of phospors that would deflect back to the read anode and then be used to guide the main beam. A second beam was used for the index stripe.

In fact, on the indextron, you can SEE the green index phospor glowing behind the bell, whenever the tube is on.