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ETK3699 Digital Kara OK Surround Reverb Delay Microphone Amplifier Preamp Board

PT2399 Microphone Audio Amplifier Board Karaoke Plate Reverb Preamplifier

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PT2399 Microphone Audio Amplifier Board OK339 Karaoke Reverb Preamp

DC5-15V CD2399 Karaoke Microphone Reverb Plate Reverberation Board DC Power