@ Melkior, Hi my friend!, long time since you come out!, I finally talked to usa tubes, they have said the same thing as you and Gammojo did that most likly is the problem!, the tubes and fuses!, however, I have to pay for shipping to them, and in turn they will pay for shipping back by air!,Paul said that useing rca or xlr most likly had eanything to do with it!, He thinks as Gammojo does, bad tubes from the factory!, we will see!, Paul is one of the usa, tube employees, which is ayon audio usa, the distributors for the united states!, they said, if they find a major issue, and the factory needs to know of a reliabilty issue, then they will send me a new unit!, paul said that is highly unlikly to be anything major!, Melkior, I always used this unit by xlr, worked fine, when I went to use it on a solid state reciever on rca there was no sound at all from the right channel!, the left channel played!, then pow!, and a small flash of light where the tubes are on the right channel!, then no sound at all, but the player was still powered on!, I quikly turned it off, and unplugged it!, I am lost for words!