If your guitar has active pickups, can you just plug headphones in and have the guitar make noise? I know it will sound like crap, but just wondering.
In theory there would be some noise made, but it will be very, very quiet and it will sound terrible, like a piezo pickup with too much treble and no bass.
Yes, I know everything. No, I can't play worth a damn.
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Most of the commercial headphones are stereo though, and your guitar has a mono output, so if you don't use a mono-to-stereo kind of jack adapter, you'll hear sound in only one of the phones.
And you won't hear anything with EMGs, because the two separate rings (ground and right channel) on a stereo jack won't be able to close the battery circuit, like that of a mono jack. I just tried it with my EMG equipped guitar and zero sound.