Thank you, but on kmg site info about output 90w transformer is very poor. I have some workshops who can wind it but for them, info from kmg site , simple is not enough. As I said i would like to try EI core because C core is hard to find in my country and C core is quite expensive (beside quality) 

Dear All,

I want to build 90W PA version , but I have a huge problem with output transformer. Plase could somebody provide me some more information about it? Link on internet where it could be bought also can be usefull. Does it someone tried to build it with EI core and could provide parameters for 90W version?  Which type of tpk-190, exactly could be used for rewinding ? Thank you in advance, Igor