Arkless Electronics
Trade: Amp design and repairs.
Hmmm... I've got a PDM1 series 2... may have to fettle it some day!
Incredibly bad advice there to leave it powered on!! That explains why every DPA DAC I've seen (4) has had completely knackered and leaking electrolytics!
Tom/DPA_Service also recommended to switch the units off when not in use. I have replaced the electrolytic psu-caps on 4(!) DPA-dacs and all of them were almost perfect in capacitance and ESR values.