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DC offset appears at the wall socket, riding on the back of the ACv we need. Of course a little DC across the transformer quickly decreases efficiency and raises the temperature core. When we apply the Auto Bias Modules in the Ella we immediately note better sound -- less strain, wider bandwidth -- because no DC is allowed to flow across the output transformer.
Today I ran the power transformer of the Ergo-Ella first plugged into the wall socket, then plugged into a huge isolation transformer we have here. I've previously measured 0.4-0.5DCv at our wall socket.
Our ambient room temperature is 34C today.
After 1 hour:
from wall socket: +24C
from isolation transformer: +21C
Next we will setup a three way comparison w/wo DC Blokker and direct from the wall.