[miniman82]

I don't recall which is which, I haven't owned a CTC-9 for some years now. But I can tell you that the type of crystal does matter, if you don't want problems I suggest that you find a good testing original replacement or equivalent. Modern (silicon) diodes will have the wrong capacitance which throws off the last IF stage tuning, and they forward bias at different voltages. If memory serves the crystal one forward biased at around .223 volts, where nearly all modern silicon diodes will be at or above .5 vdc. I scavenge replacements from other sets or swap meets.