thank you all for your answers !
I've allready try differents combinations with the preamp tubes and the problem is still here...about the relays we have chek them with a multimeter and the're working correctly ...
I will send pictures as soon as possible , my amp is now at a friend's house trying to fix the problem ( is much better than me in buiding amps) 
I will let you know how things are going !
Once again thanks a lot .

HI everyone !
Well , i have been ordering a 100w bm that i built myself .
 I do have a problem with the od channel : it stays clean ! it sounds loud but stay's clean , no od here !! at the very begining od have been working for few hours at a jam with friends ...then nothing .. on an other day it was working for few minutes and...goodbye ! it's a bit disapointing !!  i have been checking soldering , everything seem's to be ok ..
Any advices are welcome !! i'm not an ingenior ! thank you very much ! (sorry for my english !)
 

thank you erwin !
FOR the 6l6  i 'm wainting , it won't be long !
I just worried a bit about the huge difference between clean and od chanel . Od is really very loud as i expected from a 100w but clean seems to have some loss of the signal it's a bit weak , maybe it comes from the tube ?
thanks again !!!!!!!!!

 Hello everyone , i'm new on the forum !! I recently purchassed a 100w bluesmaster kit from ceriatone .
I put in it mercury tranies as it wasen't not much expensive ,well my question is : how does the od trim works , cause it seems to be just an other volume level for the the od .. as i have build the amp myself, could have done some mistakes !!
An other thing is on the clean chanel i don't have so much treeble i have to put it on 10 with the pull bright on to have a decent sound ( i'm playing with a strat ) maybe it comes from the power tubes as they are old ones from a friend ( 2 of them are metal 6l6 ..!) i'm waiting for svetlana winged c ...
one last thing is that the od chanel is two times more powerfull than the the clean ..is this normal ? maybe i have to adjust it with the od trim !!
thank you very much for your help and advices !! math.