![DIY PCB - "Butte" solid-state headphone amp | eBay](https://i.ebayimg.com/images/g/rqYAAOSw8d9U09~z/s-l1200.webp "DIY PCB - "Butte" solid-state headphone amp | eBay")
DIY PCB - "Butte" solid-state headphone amp | eBay
Sennheiser PCB With Battery Contacts For PXC 250-II Headphones 538254 | eBay
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