RCA connectors filled with epoxy, they are not removable, many top dollar cable manufacturers do the same. To remove stock RCAs user should cut them off. As i said earlier Zu Audio was a cable manufacturer in the beginning, company name was Zu Cable. These guys knows everything about cables. Balanced cables also available from Zu Audio. Their speaker cables are also highly acclaimed.
P.S. I use Cardas Solder usually, when we have to fix something.
P.S. I use Cardas Solder usually, when we have to fix something.