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Portable Guitar Amp Hiss Answered

Hi all, I have built this design with a few modifications to accommodate for the parts that I already have.

I used a stereo 1/4 inch stereo jack, but I connected the 2nd signal to the battery negative and the ground to the circuit ground. This way the circuit switches on when I plug in a guitar.

I also used headphones only instead of a speaker, so I don't need a switch.

Now the circuit works and it is amplifying the sound, except there is a very load hiss. I am assuming that a certain frequency in not being filtered out but this may not matter when using a medium quality speaker because of its low frequency range. However high quality earphones can play this sound.

Is this correct? Does the headphone work for anyone with the hiss?

Thanks in advance

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