A ground lifter plug will probably take care of that. They are available in any decent hardware or electrical store.
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Might want to check the connectors and make sure they are tight (inside and out). A buddy of mine has a 334 and he was getting some hum on his rca's and it ended up being a loose connection.
He also had a ML 38 preamp that hummed. He sold it with the hum so not sure what of the outcome? I have owned several ML amps with no problems.
The noise you are hearing is the transformer buzzing. You may want to check the power at the wall outlet with a volt meter...if possible. If it is 110-120v you are good...even 125v is ok, but the transfoemr will start to become noisey. I think around 130v the amp will shut down. Pay attention to the noise, it will probably change at different times of the day depending on the load on the main grid for the area.
Hey again, If the voltage is nearing 130v you need to contact your electric company ASAP. Once they come out to check the problem and see that it is high, they'll make the necessary adjustments at the main grid. Unfortunately, if the power is on the high side but still in range (+/- 10%) there maybe nothing they or you can do. The only thing then would be to get a good voltage stabilizer...of course it would need to be able to meet the demands of your current hungry Levinson. It's frustrating, I know, I'm living it. If you are only able to hear the buzz by puttig your ear up to the amp, you are fine. If it is to the point where you walk in the room and can make it out...there are some serious issues. Only other thing you can try is just what the other post says...check the bolt/nut that holds down the transformer. That's about it. FYI, my incoming power is 127v, if I put my ear up to my Levinson no.333 I hear a slight buzz. Before the Elect. CO. corrected the problem the power was 131v and boy was the amp loud!!