A solution has already been found a few years back for this very problem, as we reported either on the Elise or Euforia threads; it was abated simply by putting any ordinary ferrite choke (3-5mm opening recommended) over the exterior wire going to the top cap. At least this worked for me and the others who had this problem, and it worked so well that the buzz instantly dissolved into silence. But first and foremost, make sure you are using the correct adapter specifically for EL12 Spez and that the connection on the top cap is snug.I have problems with EL12 spez as power tubes.
Super loud hum, seems to not be compatible with the amp. I did try several pairs, all had the same problem. @Deyan said they might be self oscillating. What can be the cause of that ? Are the tubes faulty, the adapters or the Euphoria AE just can't handle them ? Maybe I need to to use EL11 as driver ?
EL11/EL3N is working perfectly as driver tubes for me.
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