Hi Tony,
based on the consideration that power supply units for medical devices must fulfil stricter requirements with regard to interference radiation, I have purchased a power supply unit for medical applications for my FT-818ND. The 'AC/DC Medical Adaptor GSM36E12-P1J' from Meanwell supplies 12V DC voltage at max. 3A. The transceiver copes well with this. So far I have no cause for complaint. It is significantly cheaper than the certainly optimal ProAudio solution, which I can at best only buy in other European countries.
73
? ?Willi, DK6DT