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Quad 405-2 upgrades
DADA Electronics Quad 405 Upgrade-kit with OPA604 v3 High-end boards - Full option - DADA Electronics
LJM QUAD405 CLONE MJ15024 100W 8R One Pair DIY KITS Finished Baord Dual Channel Amplifier Board w/Angle Aluminum - AliExpress
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Quad 405-2 upgrades
2 Channel 1 Pair Classic Amplifier , Quad 405 Clone (metal Transistor )assembled&tested Stereo - Speaker Accessories - AliExpress
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Quad 405 / 405-2 Power Amplifier Review
