Hello,

I have a Yamaha 100 B 212. Since I have it (2 years) I happen to rund in a strange problem, two times.

I turn it on an it stays silent. If I krank it up to 10 I swear a little bit. The low tones are very distorted.
And then after a couple of minutes, it is back to normal. (You can imagine, 100 watt amp full cranked up in your face in the middle of the night...)

Do you have any idea what I can test to find out the problem?

Thanx in advance. Michael