manueljenkin
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What is the part number of the 4 discrete opamps used in the kse1200, also about the 400V BJT pair?
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Is there a teardown image you can share please? Also the charts for distortion measurements if it was measured. They have an odd choice for the dac chip too, cirrus 4272 in their other amps, not sure of this in particular. I couldn't find much information about the chip other than it being used in a few ADCs like focusrite Scarlett and Saffire pro 40. It doesn't seem to have much folklore around it either unlike say a Wolfson 8741.
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How to approach a design that can operate properly with such low impedance loads? Or in other words, what is it in the design of Opa 541 that makes it capable of driving the raal?