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RUMBLE_SCRATCH_FILTER

2017-02-21 18:08  
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RUMBLE_SCRATCH_FILTER
Used after pre-amp in high-quality audio system to improve reproduction of phonograph records. Two-pole Butterworth design has switchable breakpoints providing any desired degree of filtering.- Signetics Analog Data Manual, Signetics, Sunnyvale, CA, 1977, p 638-639.