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Waters manufactured a number of enhancements for the Collins S-Line. The most popular unit was the Q-Multiplier and notch filter for the 75S-1. The later S-Line receivers included the
Collins OEM features into their receivers. The Waters product was simple, well designed and a popular addition. The waters Q-Multiplier/Notch Filter shown here is Model 337-755-1. The pictures show a typical
installation.
The front panel control is shown center. The rejection tuning control was modified -- but no new holes.
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