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09-16-2005, 04:05 PM
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One other item I found in the Apple documents on the Philco TV-123 sets, was they were designing the TV-121 in late 1954, and the TV-122 in early 1955. The 122 appears to be the prototype for the 123, the circuitry is virtually identical and it used some proprietary tubes in the LV power supply and HV circuits. From the documents they never built a model of the 122, but may have built a 121.
The 121 has more in common with the 123 than the earlier prototype of 1953, in fact comparing the schematics it looks like Philco discarded pretty much everything in the prototype when they started the TV-121. And Don you are correct, after restoration and alignment the picture quality of the TV-123 is great. Chuck
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www.myvintagetv.com Learn from the mistakes of others - You can't live long enough to make them all yourself. Last edited by ChuckA; 09-16-2005 at 04:12 PM. 
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