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Amazon.com: Taidacent LM1036 Bass Treble Board Pre-amplifier Audio Tone Control Board Volume Adjustment Bass Tone Circuit (fixed potentiometer version) : Musical Instruments
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Dual NE5532 Tone Stereo Preamplifier Board Audio HiFi Amprifier Equalizer Preamp Treble Bass Tone Control Pre Amplifier - Walmart.com
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