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Originally Posted by Chad Hauris
Bobby, the motel/hospital etc. sets did use the square type knob whereas the consumer sets usually used the type with a bar type grip. The motel sets were branded RCA Mural TV and had other features such as a 75 ohm coaxial antenna input and a cover panel for the service controls.
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I can understand covering the controls to keep people from tampering, and using a 75 ohm connector for connection to a MATV system, but what is the reason for using a different tuning knob?