I understand that only one transistor conduct at a time .
The collectors are connected to start and end of the primary winding of the load.
The center tap is connected to power supply.
What is the direction of EACH part of the load coil ?
Usual "DOT" indicating start is missing from schematic .
Should "dot" be at the collectors ends - hence winding in OPPOSITE direction ?
Or should only ONE collector end have "dot" and the other "dot " being at center tap - hence both winding in SAME direction ?
Or does it matter ?
In theory only part of the wave is active and passed to secondary winding of the impedance transformer.
And does it apply to push -pull when each transistor passes only half of the wave ?
Should the wave appear (amplified ) SAME - with two half opposing each other , on secondary ?
The extremely old RF amplifier in the other forum does not have any negative feedback then the phases of the windings of the ferrite transformers do not matter.
You have been asking for push-pull amplifier, not doubler circuit. Push-pull means one transistor is generating the positive ouput wave, one the negative.
You are starting the winding e.g. clockwise at one collector and continue til the other collector, with a tap in the middle. The winding instruction already defines a dot polarity. If you don't see, Easy peasy has clearly described the dot assignment. What's still unclear?
T2 pri doesn't really need dots as it's drawn to show the connections very clearly, for the newbie:
If we say the TOP is a DOT or a START, then at the junction, in the middle, we have a NON-DOT or a FINISH, joining a DOT or START on the next winding down to a NON-DOT or FINISH as the bottom ....