Thanks again :-)
Unfortunately as an old owner of Ayon CD5 I was absolutely not aware of this as I found nothing concerning this issue when I bought the unit..So I bought power amps without checking the impedance value. Anyway I know now how to handle this.
I've found an incredible volume control / preamp, totally transparent which at the same time solve the impedance matching problem, for a ridiculous price (350 euros), it's a SPL Volume 2 :
http://spl.info/produkte/monitor-controller/volume2/beschreibung.html
So in case of noise or too low impedance I just need to put it between the Ayon and the power amps (full XLR)and everything becomes silent, no need anymore to disconnect the ground of the monos power chord.
I Have exchanged the original tube for 6H30-DR, but as suggested I'll put the original ones to check if there's a problem or not (not so hard to find 6H30-DR but real matched pair is an other world).
Unfortunately as an old owner of Ayon CD5 I was absolutely not aware of this as I found nothing concerning this issue when I bought the unit..So I bought power amps without checking the impedance value. Anyway I know now how to handle this.
I've found an incredible volume control / preamp, totally transparent which at the same time solve the impedance matching problem, for a ridiculous price (350 euros), it's a SPL Volume 2 :
http://spl.info/produkte/monitor-controller/volume2/beschreibung.html
So in case of noise or too low impedance I just need to put it between the Ayon and the power amps (full XLR)and everything becomes silent, no need anymore to disconnect the ground of the monos power chord.
I Have exchanged the original tube for 6H30-DR, but as suggested I'll put the original ones to check if there's a problem or not (not so hard to find 6H30-DR but real matched pair is an other world).

