Hi Nilthepill,
I had similar experience in 2008 I sent that same DAC to Japan,they did an excellent job at an exorbitant cost.I did contact Eric he is always willing to assist,but his recommendation was change tubes or send to Japan.I had a different suggestion from another audiogoner who has experienced the same problem that it may be a defective choke.I just wish that we could have access to experienced audio electronic technician that had the skills to do minor repairs of overseas manufactured products with no US service and even more important the ability to repair classic electronic components of now defunct companies such as Cello.
I had similar experience in 2008 I sent that same DAC to Japan,they did an excellent job at an exorbitant cost.I did contact Eric he is always willing to assist,but his recommendation was change tubes or send to Japan.I had a different suggestion from another audiogoner who has experienced the same problem that it may be a defective choke.I just wish that we could have access to experienced audio electronic technician that had the skills to do minor repairs of overseas manufactured products with no US service and even more important the ability to repair classic electronic components of now defunct companies such as Cello.