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My two 136 sets are from '87 and '89. The '87 one is knob tuned and does not mention "Thomson" on the back. The '89 has electronic tuning and mentions "Thomson" on the back. I think there may have been an early version of the 136 with a single knob varactor tuner and the same chassis was installed in RCA-branded TV's (in both XL100 and colortrak models). I recall those MTT tuner modules being high as a cat's back, even 20+ years ago. Fortunately, most MTT modules can be fixed without having to replace them. The 146 was made up until around '92, when the CTC175/6/7 chassis with the problematic "tuner on board" came out.
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