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Adapter jack 6.3S / plug 3.5 | Sennheiser Consumer
3.5mm FEMALE MINI to 6.3mm MALE JACK ADAPTER STEREO HEADPHONE CONNECTOR 665659351226 | eBay
Amazon.com: Mobi Lock 6.35mm Plug to 3.5mm Socket (Pack of 2) 1/4 to 1/8 inch Stereo Audio Jack Adapter | Converts Audio from Amplifiers, Guitar, Piano, Drums, Speakers & Mic That use