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Check to see how many bits quantizing it is. Early TBC's were 8 bit. Later ones were 9 bit and the best were 10 bit. Quantizing is the process where an analog wave is chopped up into bits. An 8 bit box would give 256 levels of the video signal. A 10 bit box would give 1024 levels. Obviously more bits require more memory.
The SMPTE standard that was finally adopted (back in the early 80's) was 10 bits at 4fSC.
The one I liked the best was the DPS Phaser (I or II). But the tektronix and Sony are good too. Those are old broadcast units that you might can find used at a good price since all that analog system equipment is obsolete now. Good luck!
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