I finally got around to cleaning out my headphone amplifier today. There was some dust in the volume potentiometer which was creating a hissing sound when adjusting the volume. Some contact cleaner has it better than new. While I had it open I thought I would take a picture to share.
A Clash of Coasts 
I hate to imagine all dust and grime in all my electronics! Goes along with the rest of the house!
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I’m catching up with your recent posts. Love the insect photos. You may have told me this before, but what kind of lens are you using? I like the narrow depth of field — are you using a telephoto lens? As for the electronics — I didn’t know that headphones had amps! I just plug into the computer. (But then I’m only using Apple earbuds.) Anyway, keep those posts coming.
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Most of the insect photos I attribute to extension tubes, which also shorten the depth of field -> https://aclashofcoasts.com/2020/07/02/shooting-macro/
This headphone amplifier is probably overkill. In general they are used for larger, high impedance, headphones; which require more power to drive.
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