I too solved the transformer hum on my Odyssey Kismet Stereo amp using a DC blocker (iFI SilentPower). One nice thing about the iFi product is that it’s sold through Amazon Prime, so if you aren’t sure whether him is caused by DC, you can buy it, try it, and return it if it doesn’t solve the issue.
On the other hand, it’s very light weight and made of plastic, and it feels like my heavy 7 GA power cable is gonna pull it out of the socket.
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Edit: with the iFI SilentPower in place, my Kismet is dead quiet. So glad I found this thread and gave the dc offset blocker a try. I’d suggest anyone else suffering from transformer hum to look into the various causes including dc offset. These amps are amazing when fed clean power.
