Hamilton Buhl SPP-MJS Adapter at Learning Headphones
Amazon.com: GLS Audio 1/4" Plugs for Patch Cables, Balanced Cables, Snakes - TRS Male Stereo 1/4 Inch Phono 6.3mm Phone Plug Bulk - 4 Pack : Electronics
10pcs 3.5mm Audio Jack Pcb Mount Screw Metal Nuts Mono Stereo Phone Plug 2 3 4 Pole Connector Through Hole Panel Mount Thread - Connectors - AliExpress
3.5mm Stereo Plug
Direct Sound 3.5mm Stereo to 1/4" Stereo Non Screw- GNSOA2925