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Looks like a lower end model from about '83-'84. It looks to have a pull-on/volume knob, with non-cable ready (red LED readout) electronic tuning. It probably uses a 9-181 signal module and a 9-186 HV/sweep module.
You got that 100%. Cheapest model probably sold at a
big non TV store.
I think TUD1 would enjoy a flat chassis SS set. Still lots out
there waiting to be found. 40 yrs old & often still working.