Using schematic to calculate transformer windings.

[gkmaia]

It's a blocking oscillator, Q454 is actually going to control it (frequency modulation, sort of; more on that later).  The feedback winding will be sized to give ca. 1-5V.  Less and there's insufficient gain for hard switching, more and V_EB is exceeded, drawing bias current through that path, and Q458 literally beats itself to death (or until R458 fuses).

I finally managed to get it down to 50khz but needed to replace the the coil former.
The 1st secondary outputs -126VRMS (factory is -120VRMS)
The 2nd secondary outputs - 228VRMS (factory is -220VRMS)
Haven't done the HV winding yet.

If you look at WA00002 that is the feedback winding. It's -Vp is at 8v and seems ok. But the +Vp cannot pass +5v.
Do you have any idea about what may causing that?