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WB IQ schematic found!
Stromberg67 of Rectangle and Solid State posted this, check it out:
[QUOTE]Hi Folks: I have the SAMS for my CTC-133B open in front of me, and the chip designated "U 700" , a 42-pin DIP, shows I and Q demodulators and amps, and the integration of luma and chroma signals on the chip.[QUOTE
Kevin.........That CTC133B schematic is a great find! The RCA number 176225 crosses with Hitachi, maybe its the same chip? The fact that it combines luma and chroma at low levels instead of at the CRT is great. It's probably why you get such great color detail. I bet there's a lot of inductors and caps around the chip to do all the required filtering in analog. Is there any way you can scan or photo the small schematic portion around the chroma demod chip? Can you PM me for my email address. If the chip is available ($5.00), it would be fun to attempt to build up the circuitry and try it out. Thanks, Tom
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