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I think that Zenith is one of the last one-knob tuners from around '84. A friend had an identical set that used an inline tube and the 9-181/9-186 style chassis. His finally died and got junked because both the 9-181 and 9-186 were bad. If you can find a date on the back, that will help determine what chassis is in it. If it's '79 or older and has a circuit breaker and an AC interlock where the cord goes in, it's a Chromacolor II. The 9-160 type System 3 chassis was used from around '79 to '82. The 9-181/9-186 chassis was from about '82-'86. Unless it's a CC II, I wouldn't fool with it unless it worked good.
The Sentry 2 looks like one of those '90's jobs and probably has a bad CRT. I wouldn't touch it with a ten foot pole!
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