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Have dont it many times for testing. Like said its never strong enough and sometimes you end up with a negative image depending on how the set is designed.
The picture really isnt noticeably better if the front end is working right. Often its better with the IF and tuner because you can run the fine tuning up to crystallization and 'peak' the video sharpening the picture.
The big improvement is the sound. It gets rid of all the buzzing and video noise, you can easily disconnect the tvs audio source and feed it your line level signal.
I would guess you are talking about 40-60s tube sets?
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