I know...old topic....but here goes:
I recently bought a chinese intergrated amp, and I notice the power connector says 110v.
Ok....
Measured my AC and its about 125v.
Ooops.
Opened the amplifier, and measured the filament voltage across the EL84s: 6.5 volts, supposed to be 6.3.
Next, I measured the plate voltage and its about 470, with a couple of 450v caps..
Ooops.
SO...I ordered a variac and a stepdown transformer...when I get those in I will do some more testing.
You know, this little amp might last 100 years or it may go thru tubes every 2 months....and blow those caps too...
Updates will follow...