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Yes, I am well aware that the voltage will sag a bit when the variac is feeding the Bev amplifier

But I felt that uncertainty was preferable to risking my life and/or my Fluke meter, trying to measure AC inside the chassis; it's quite cramped near the power transformer. Anyway, this is not the main issue, because for whatever the AC voltage is, perhaps a volt or two below 115V, worst case, the voltage across some of the 8 series-connected capacitors in the filter is approaching that of the max voltage rating of the capacitors (450V). If in the real world the AC input voltage is going to be higher, that could only make the issue more of a problem. I also mentioned somewhere that these amplifiers do not draw very much current, based on the reading of the power meter on the PS Audio P15, when it is delivering a regulated 120V. With both amplifiers powered up, the meter reads barely 3A. And I have already been convinced to swap out the 450V caps for 500V ones. That should be safe. The original schematic, of which I have a copy, called for 450V.


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  • Yes, I am well aware that the voltage will sag a bit when the variac is feeding the Bev amplifier - Lew 10/21/2016:12:50 10/21/20 (0)

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