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XH-A901 NE5532 Tone Board Preamp Pre-amp with Treble Bass Volume Adjustment Pre-amplifier Tone Controller for Amplifier Board - Walmart.com
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Electronic Spices 3 Channels Preamplifier Tone Board Audio Bass Treble Control Equalizer Board works on 12-0-12 transformer and better IC : Amazon.in: Electronics
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XH-A901 NE5532 Tone Board Preamp Pre-amp with Treble Bass Volume Adjustment Pre-amplifier Tone Controller for Amplifier Board - Walmart.com
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Amazon.com: Digital Preamplifier Tone Board, Upgraded 2 Channels Amplification Preamp Tone Board Equipped with NE5532 Chip, DC12V-24V Adjustable Treble Alto Bass Pitch & Total Volume with 3P Audio Wire : Electronics
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