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I tried one of those one tuber's, a Blonder Tongue 99 on my CTC-20 color set and it worked but had bad contact issues in the tuner mechanism. I pulled the chassis out (2 screws and remove the pull off knobs) and sprayed isopropyl alcohol in it and the wafer in-out switch while working the controls. After thorough drying I then I applied WD-40 to the tuner sliding contact with a Q-tip. Put the thing back together and all the intermittent issues had disappeared. I get the impression it needs a good strong signal to work well (I used my tower antenna with tower mounted amp) and got good reception. Kind of a pain to use though, but it was a way back then of opening up a new horizon so to speak. There were better ones made with more than one tube, some sporting RF gain stage which would be better.
Try it!
Rob
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