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Sorry to get off topic.
My Heathkit GR2000 had a rough time with off-tape sync. Too much flagging at the top of the picture. Some tapes were worse than others. BUT I found some sets had absolutely no problem with off-tape sync.
There are 2 things to remember about tbcs's. One is quantizing and the other is sampling. Quantizing is the number of levels an analog signal is chopped up in the A to D process. An 8 bit box will slice it up to 256 levels. A 9 bit box would slice it to 512 levels . And a 10 bit box would slice it to 1024 levels. Obviously the more levels would provide greater "resolution" of the signal, but at the expense of requiring more memory.
Sampling is the rate of conversion. Early tbc's were 3fsc (about 10.7 MHz.) and later ones were 4fsc (about14.318MHz.). Requiring a faster memory.
Low end tbc's were 8 bit. Ampex tbc's were 9 bit. Sony and Tektronix were the Cadillacs at 10 bit.
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