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Amazon.co.jp: Q-BAIHE QUAD 405 QUAD 606 Rear Power Amplifier Voltage DC±(25V ~ 55V) Upgraded QUAD 707 Dual Channel Kit 2 Board : Electronics
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QUAD606 Stereo Power amplifier Base on UK Classic Power amplifier QUAD 606 circuit 250W+250W DIY Kit/Finished board - AliExpress
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