Seems to me like both chokes are being fed the same signal from the secondary , only difference is their direction .
Reult will be the same than with a perfect bifilar thats only getting pulsed by one side . Choke 56 will induce the same exact current/voltage in choke 62 .
In this case both chokes are being pulsed ,so one induces the other and vice versa ... no big difference .
Alan , just saw this , will read up later .
I`m in class now , supposed to be listening .