I am working on what was a nice pre-amp which has been upgraded by a customer with:
- CNC sockets which seem to need a blow torch to solder to effectively.
2. A typical silver solder of a type which does not flow properly. (Some with many additives do better e.g. Cardas.)
3. Oil impregnated hook-up cable which needs to be cleaned scrupulously to get a good joint and were not.
Put the 3 things together and you can get terrible solder joints and a sound which is a significant downgrade… 😂