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If it's sufficiently hopeless that it needs to be replaced, maybe you could make this bad tuner a channel 3 only tuner. Solder the switch contacts permanently to the channel 3 position, and feed this TV set with a DTV converter box set to analog channel 3 output. Analog over the air TV is going away next Feb anyway...
When a good tuner comes around, just replace the channel 3'ed one with it.
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