Audio Cable 1.2ft 0.35m Shielded Mono Cable 6.3mm male to 6.3mm male plug CM-05 6 pieces/lot - AliExpress
Neutrik 6.3 mm mono plug (angled, silver, NP2RX) - Custom Boards Finland
Tube-Town Store - Adapter - RCA Phono Cinch female to 6.3 mm mono Jack
Tube-Town Store - Jack plug mono, angled, 6.3 mm silver
Electric Guitar Bass Acoustic Instruments Audio Cable 15ft (4.5m)shielded Mono Cable 6.5mm Male To 6.3mm Male Plug Multicolor - Guitar Parts & Accessories - AliExpress
Mono Jack 6.3 mm (female) - RCA adapter | MadBoy Premium Karaoke Systems | Webshop