Presumably a stock fault with these Euphonic Audio, USA amps. I'm having to
replace all 8 of the 1/4 inch jack sockets. 4 of the 8 are totally breaking
up inside. Assembly flaw - they used unreinforced plastic spacer rings on
the bush inside the chassis, not dense fibre washers. The ring breaks and
the bits drop away and owner tightens up the front nut, not realising that
without the spacer then the socket is skewed/levered against the pcb and
rear of front panel and the socket housing starts cracking up. Otherwise
sturdy but now detrimental soldering of the pins does not allow any give
there. The pins are joggle-formed to tightly fit double-belled eyelets and
soldered through the board so as solid as can be, with base of socket tight
to the pcb.