one thing to consider is the E30 DAC uses a DC power supply, as is normal, and the L30 Amp uses an AC power supply, which is rare, and then uses a standard DC port for it. a potential reason for these being fried would be either upgrading the power supply without realizing it’s AC and not DC, or accidentally using the E30 power supply for the L30. I would still hold off on using the L30 at all, but it is an avenue for investigation
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