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” Once we take a quick history lesson from the MSA, we get at a perfectly open Nagra secret. Nonetheless, it still comes as a shock to many who associate the company exclusively with tubes, hence linear technology. This engineering team from just outside Lausanne are experts at switch-mode power supplies. As Chord and Linn have done for untold years in the UK, Nagra have amassed decades of experience with this energy-efficient power-factor-corrected technology already. As you can see, the MSA had it. Would the more powerful Classic Amp? Unlike its gigantic HD elders, it’s still reasonably compact. And some of its new height is taken up by a heat sink ceiling. By necessity of its higher dissipation which supports about double the output power over the model it replaces, that thermal exchanger must amount to twice the mass over what the MSA flaunted. Everything thus pointed at an SMPS for the Classic too. ”

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