Slight hum in my amp. Is this normal?

Go under chassis, remove the transformer screws, apply some blue tac or similar substance to the holes and re-tighten the screws. It will lower transformer noise.

Received the Emotiva  CMX-2 which made no difference in suppressing the 60 Hz hum (clearly heard thru my KEF Q1 monitors 12 inches away).
No source was connected, hum did not vary with volume and mute button made no difference. I've given up hope of using this integrated with my Klipsch LaScalla IIs. I'll be content using my BAT VK-300se 150 wpc integrated which is dead silent. Sometimes you get what you pay for...

@dweller

Emotiva has a customer friendly return policy should you choose to go that route.

https://emotiva.com/help/faqs/return-policy

It's a beautiful unit and extremely well made (big, beefy power cord). I don't need it so may try to return. Thanks for the heads-up!

atmasphere

But its still an AC waveform and so can travel through a transformer. But the output will still be asymmetrical.

Is it really DC in the true sense/meaning of the word? Does it build to a DC voltage and then fall to zero at each half of the waveform cycle? If so then I could see how it would pass though from the primary to the secondary winding of an isolation transformer.

Sorry for my ignorance. I am just trying to better understand what is going on.
I do know there are people that say that an isolation transformer will block DC offset on the AC mains from the secondary of the transformer. I personally do not have any personal experience whether it will or not.
I believe you when you say it will not. I also believe that to be the case from actual bench testing which you have done.

I know AC and DC can both travel in a circuit at the same time. And yes I know the DC can be blocked using a DC blocker allowing only the AC to pass though the circuit or another circuit.

I know a pulsating DC voltage source, such as a battery, can be transformed, for lack of a better word, but constant DC voltage cannot. (As long as the applied voltage is constant.) If a constant DC voltage could pass through a transformer then an output transformer on a tube power amp would pass DC to the speakers.
Jim

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