OK, I have changed the OT wires and no more high pitch tone. 
The BIAS now is at 41,5mA, a little cold but thats no problem.

Only problem to solve is the Rock/Jazz switch, I checked all the wires
and can't  find any mistakes.
Still a big volume difference when I switch between Rock & Jazz.

The tone is fantastic, cleans are very rich and warm.
OD is a little harsh but I will mod the 150k to 220k & the caps to 330pF.

Thanks for your help so far.
If anyone has thoughts about the Rock/Jazz switch, your posts are welcome.

Thanks, that was what I was thinking.
I saw some good pictures of a build Overtone and indeed, the
blue and brown OT wires were soldered to the other tube socket.

I will try this tomorrow, its almost midnight overhere.

Hello I've ordered my Overtone as a Kit and build it like the Layout.
It works but I have two problems.

First is a high pitch tone even with all controls set to 0.
This stops when I set the Bias to 20mA or lower.

Second is a very large difference between Jazz & Rock.
Rock is at least two times louder than the Jazz setting.
Or is this normal?

Any suggestions are very welcome.