Mario Bros Speaker/Sound issue

Now, one thing I noticed, was when turn the volume all the way up, without the speaker hooked up, I am still getting sound from the monitor...

is this normal?
Yes. But turn it down/off before you blow up the audio output transformer.

What you're hearing is the windings and laminations in the transformer vibrating...

-Ian
 
It might not be interference really. Doesn't affect the monitor.

IT is just a very loud hum even with the sound turned all the way off.
 
The hum sounds louder than average but FYI all Nintendo games hum.

They do all hum. But it should be a barely noticeable, quiet hum. If he's getting a very loud hum, it's caused by something else - which is almost always caps on the sound board in the monitor.

-Ian
 
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