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The advice to monitor sound and video simultaneously with a dual-trace scope is certainly a step in the right direction re:fixing your Porthole.
A quick 'n dry test for if your I.F. stages are lined up is to inject video of a Center Cross pattern right after the detector and note the response while fine tuning the station.
Once I had a b/w set with broken fine tuner mechanism and it made things seem like a full alignment would be required .
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