hifi said:have anybody done such a design or know any schematic?....preferably a balanced design but that is not required the load of the aleph amp is low 10kohm...but i would like to use a tubed crossover anyway...
The Marchand Tube crossover schematics are in their downloadable manuals. They can be made balanced I/O by using suitable Transformers. By using a 4:1 Line Input transformer and changing the first buffer stage to one that combines a gain of 16 and a buffer stage you can get the whole X-over to work at a higher level.
Then add suitable output transformers with stepdown (S&B, Jensen and Sowter have nice ones in their pro ranges) and use a follower valve with more current (eg ECC82 instead of ECC83 and reduce th cathode resistor in the marchand design by a factor 5 - 6).
That way you have an output that will tolerate 10K load easily and is balanced. Using a 4:1 stepdown you will have a 10K load translated into 160KOhm in the transformers primary.