I think these are useful:
/g/BITX20/message/22955?p=Created,,,20,1,20,0::recentpostdate%2Fsticky,,,20,2,0,4438163
"?I have a box full of trifiilar wound, FT37-43 that I can solder in anywhere."
/g/BITX20/message/22967?p=Created,,,20,1,40,0::recentpostdate%2Fsticky,,,20,2,0,4438163
"T10 and T11 look like all the other trifilar FT37-43 transformers but as they are both handling power I assume they need something bigger. Ashar, what cores did you use?"
/g/BITX20/message/22968?p=Created,,,20,1,40,0::recentpostdate%2Fsticky,,,20,2,0,4438163
"T10 is same. T11 is not really a trifilar transformer. Instead, it is an 8t:10t transformer on an ft3743. As there is no dc through T11, it can handle 10 watts of rf."
