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AIYIMA Pre amplifier Tone Board UPC4570C OP AMP Stereo Preamplifier Volume Tone Control Super OPA2604 AD827JN With LM317+LM337|tone control board|volume tone control boardstereo preamp - AliExpress
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TC3 Three Band Tone Control PCB (Bass, Mid-range and Treble) (Stereo)_Bare PCB_Analog Metric - DIY Audio Kit Developer
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