the apple..

[ChuckA]

I have been converting a large collection of "Apple" documentation that was acquired from a Philco engineer into PDF documents that can be downloaded from my web site:

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

I have maybe 15% of the documentation converted so far.

To answer your question, Philco did produce 12 sample "Apple" sets for evaluation, but regretably they all were destroyed. Over the 10 years they worked on the project there were about 200 CRT's constructed, but none have surfaced. The documentation shows that quite a few were recycled as new procedures were found. With that many units produced I would think that at least one unit should come out.

One big benefit of the "Apple" tube was the increase in brightness due to the tube not using a shadow mask.

The earliest tube used vertical scanning, this was dropped very quickly as the technology to track the beam location and ability to produce the required phospher stripe quality was not available at the time, so they returned to the horizontal scan.

ChuckA