Sounds a bit like the PWM power supply used by Sony in their wonderful little TA-N86 amps back in the day. They used 400mHz Motorola power transistors to get 70wpc class A/B or 16wpc Class A. Sucker ran so hot that it almost always fried the 85C caps in a couple of years. Replacing with 105C rated caps solved the problems. Am guessing Marantz has solved this problem all ready.
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Glenn...
Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag
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