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Width Controls seem to vary in sensitivity from brand to brand, set to set, etc.
The RCAs that I own of that same vintage (721TS, 721TCS, 630TS) seem to need quite a few turns of the Width Control before you get any change.
Now, my 1950 Zenith 12" Porthole, with the Width Control on a slider, is way more sensitive. You breathe on it and you get a change.
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