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I happened to have the Sams photofact(1024) of this set(I have since sent it to Charlie). The set has a transistorized IF and some other solid state circuits if I remember correctly.
In the same folder is a Montgomery Wards B&W set that is completely solid state except for the HV rectifier. I also have three small Philco's and a Sylvania of similar vintage that are solid state except for the HV rectifier.
In, addition, in my workshop, I have a 1970 Sylvania table top square tube color TV that is solid state with the exception of the vertical and horizontal circuits. The Sam's for Charlies set was issued in 1969.
As you can see, solid state circuitry was fairly common in TVs of this era.
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