Unfortunately Hegel amps seem very susceptible to DC offset on the mains due to the open, large toroid transformers. You probably know this but it’s easily solved by one of the devices that remove this - I’ve mentioned a few here:
Unfortunately Hegel amps seem very susceptible to DC offset on the mains due to the open, large toroid transformers. You probably know this but it’s easily solved by one of the devices that remove this - I’ve mentioned a few here: