Are anti-cable interconnects properly shielded?

Shielding is a band aid. Sometimes it is necessary.

Back in the 1950's I built the Heathkit (Mono) preamp. It had extensive shielding of its internal wires. Still it humed.

Next I build the original Dyna Kit (Mono) preamp. Absolutely no shielded wire. Dead silemt.

Circuit design is the key.