Sorry to hear about your loss, Ragnar. My Radio Shack floor muffin is the quietest AC adapter doodad I've found. Dunno if they still carry it. It was catalog number 273-1653B. Came with plug adapters for just about every connection.
Weight and mass do seem to be fair indicators of freedom from RFI/EMI. Good noise reduction cores are big and heavy. The smaller, lighter wall warts seem to cheap out on the noise controlling bits.