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Old 06-27-2010, 05:59 PM
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Dave A Dave A is offline
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Join Date: Aug 2003
Location: SE Pennsylvania
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To save a lot of space here, this Wikipedia article does a good job of explaining the original Apple tube and the beam-index tube;

http://en.wikipedia.org/wiki/Beam-index_tube

The photo is my Indextron on the left next to my Sony KV-5000 CRT 5" set. The stripes are obvious.

More on the Apple can be found at Chuck A's website. Lots of original Philco documentation;

http://www.myvintagetv.com/philco_apple_tube.htm

And the schematic of the Indextron is attached if you want to reverse-engineer the thing . The photocell is on the "N" board. Courtesy of Jerome Halpen. There are previous VK threads on the Indextron if you search.
Attached Images
File Type: jpg index6.jpg (43.6 KB, 202 views)
Attached Files
File Type: pdf Sony_KVX-370_Indextron-04.pdf (353.2 KB, 74 views)
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Last edited by Dave A; 06-27-2010 at 06:02 PM.
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