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I agree CTC-7 to 9. It's hard to tell, and I've seen the aux controls mounted either on the side or on the front on both chassis types. On sets with higher-end cabinets, it's a little easier to tell because the 9 went to a brass channel knob with the numbers in a coaxial knob, and the 7 kept the peep window.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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