So to be clear you only get transformer hum with the A2 boards installed and not the LIM? Seems weird to me maybe contact schiit. Otherwise maybe check for DC on the mains, that can cause hum.
Ah right well if one has it and the other doesn’t, i doubt the difference in load on the transformer is big enough to cause this(LIM being a bit more efficient iirc). Again probably contact schiit. Maybe there is other stuff going on that’s affecting your impression of the A2?
yeah, one option is to get the chassis upgrade, let Schiit know of the transformer hum and get the boards at the same time. Exchanging them back to A2 will be easier.
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