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If it doesn't have to be a clean some you may be able to use TVS diodes (think Zener for AC applications), but I don't know if they go that low....ISTR from the pilot TV threads on ARF that to clamp the 3KP4 heaters at 6.3V they needed an 8.2V diode so maybe the peak VS RMS conversion might push the .55V up closer to something a TVS can do.
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