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Take a closer look at the crystal symbol on higher magnification. It's three parallel lines with the center one being a little bit shorter than the outer two lines. No arrow symbol here. Look at CR301 and CR301, the video and sound detectors. They have the typical arrow pointing toward the cathode in additional to a + symbol.
I worked for Scientific-Atlanta in the 1970s and we used CR for all diodes and XTAL for crystal designations.
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