I have a strange problem with my SOHA II.
When I turn the amp on there's a relatively quiet hum in the background.
That hum does not change with the volume - it stays constant.
Over several minutes ( two or three ...) it becomes louder, then a quiet hiss joins in.
Then this hiss gets louder while the hum becomes quieter.
Both fade out together - then the amp is dead quiet.
The amp runs without problems apart from that - sounds wonderful!
I hope somebody has a clue...