I did enjoy it today but I guess that things are getting worse.
This happened after I played my AFD100 with these settings today: Master Volume - 10, Power - 3-5, Gain - 6-8..
Well, I didn't notice anything while playing, only when I finished playing and looked at the back of the amp. Still everything works and sounds great.
Anyway, I have ordered four JJ EL-34 already, and I'll get them at Saturday. But still it disappoints me to see this happening to the amp.