@CDKUZNEC
Data for EE55 for 1200w Frequency 65Khz B max 1360 guass at max voltage
output voltage minimum 74.5v rated 83.9 maximum 87.5v Output current 8.5 amps at 170 volts
(Note this is the peak voltage observed at the specified input voltage as the smps is not regulated)
copper wire dia 0.5mm for all windings
Input voltage Min 205vac rated 230vac maximum 245vac
Primary winding 2 bundle of 4 wires twisted (total 8 wires) Primary turns 6+5 total 11 turns
Secondary winding 2 bundle of 4 wires twisted (total 8 wires) for each of the dual rail 6+6 turns
You have different voltages for auxiliary windings please take a look at attachment and choose what you like.
A fan will be needed for the amplifier so it is good to make auxiliary winding for power of fan motor 12v or 24v
Volts per turn Approximately = 155v / 11 turns = 14 volts per turn
You can take an idea how to wind a safe transformer please see video on Youtube You can translate in Russian subtitle
LINK
https://www.youtube.com/watch?v=_K3ixhcTYFg&t=1s
Regards Silvio