Just found another 1976 Bicentennial on ebay using a different chassis than mine. I've got the 12SE chassis dating from 71,which is all tube except for the UHF oscillator. 9 tubes plus CRT.
The one on Ebay a 12SF chassis.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=300305223469 The sams is dated from 74. Its a hybrid chassis with transistors and 4 tubes, and even an IC chip for the audio.
Was mine an entry level model and the 12SF the luxury? If not its starting to make sense they were using up left over parts, starting with 1971 era stuff working their way up.
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Matt D