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LM4780 Gainclone Chip-Amp Project

After successfully building my LM3886-based gainclone project amplifier, I’ve decided to build a version that is better suited to driving low impedance loads. This lead me to the LM4780 chip from TI, which is just two LM3886 dies in the one package. It can be used as a stereo amp, or a bridged or paralleled […]

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Pioneer SX-1250 Replacement Power Supply Capacitors

These Pioneer SX-1250 Replacement Power Supply Capacitors are serious capacitors! These Nippon Chemi-Con parts have just arrived from my supplier and I’m now ready to restore the power supply of the big Pioneer SX-1250 ‘monster receiver’. Read about this complete restoration here. New Caps I’ve selected new capacitors that have a greater capacitance than the original

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Kenwood KD-500/KD-550 Turntable Review

Kenwood’s legendary KD-500/KD-550 direct-drive turntables are classics from an era when things were built to last. Indeed, if decks like the KD-500/KD-550 with this level of custom engineering were manufactured now, they would cost many, many thousands of dollars. The Technics SL-1200 is a classic example – it’s recently been reissued and costs thousands. This

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Ortofon MC Jubilee Moving Coil Cartridge Up Close

This is a short article and video about my Ortofon MC Jubilee moving coil cartridge. The Ortofon MC Jubilee is an amazingly good cartridge. My understanding is that Ortofon sold quite a few of the, despite the high price. Here in Australia, they retailed for around $2700 AUD. That didn’t deter me and I found

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Dual 601 Belt-Drive Turntable Service

I’ve just had a classic Dual 601 belt-drive turntable in for a major service and it’s almost as good as new! This particular Dual 601 needed recommissioning after an extended period of more than ten years in storage. The automatic tonearm functions were not working correctly and the deck needed a comprehensive grease and lube,

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Repairing a Denon DP-1200 Turntable With Speed Issues

Hi vinyl lovers, I recently serviced and repaired another Denon DP-1200 direct-drive turntable with speed control issues. Speed Issues This particular Denon DP-1200 was cosmetically good, but would not hold the correct speed. The fine speed adjustment control was also very ‘touchy’ and the platter speed would vary wildly when it was used. These are

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