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Photofacts are only a snapshot of one production run - usually the base model set, or the most popular in sales. Sams published production change bulletins (PCB) in later Sams Photofacts, but only when received. Many manufacturers, Zenith included, kept production changes from Sams - and the multitude would never be published by Sams anyhow. RCA made 36 (that I know of) production changes to their CTC76 chassis - Sams reflects only a couple.
The online Sams site lists zero PCBs - you gotta use a paper index to find them, if Sams ever published them. Same for a lot of the Sams Servicer info - only the (older) paper indexes list them. Get an index prior to the 2003 index - after that, a lot of older Sams aren't listed - they started their Photocopy Service...
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Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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