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"I was completely blown away by the quality of the work you performed on these very old (70+ years), home-made 78rpm records. I had not tried to even play the records for decades because the last time I tried it was impossible to hear much of anything but the scratches. I realize that a couple of them were not able to be fully restored - that ..."

Bias trap

Low-pass filter in tape replay circuit designed to attenuate any high frequency bias present, thus preventing it from overloading the record or playback amplifiers in a tape recorder.