4000.1

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Now rectifiers, feedback the resistor is extracted. The first drawing is without a 9v battery, the second with a 9v battery connected across the negative rail caps. What's next? Do I need to return the feedback resistor?
 

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The pulses on the gates of all 24N40F are in the first figure. As can be seen, the average value of the pulses is not 0 Volts, but, approximately, minus 4 Volts. So it should be?
I sent a musical signal to the input of the amplifier - the duration of the pulses on the gates began to change.
Returned the feedback resistor. The pulses on the HI side disappeared, and on the LO side - in the second figure.
Can I test anything more without rectifying diodes?
 

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Could be used but too hard to replace if damaged.

You can make your own low voltage supply by winding about 5 turns around one of the power transformers. You want to use whatever number of turns that give you a ±15v output on the windings.One end of the winding will go to the secondary ground. The other will go to two rectifiers (should be high-speed or fast recovery types). The winding will go to the center of the two rectifiers. The output of the two rectifiers will go to the rail caps.

I strongly recommend that you use a current limiter between the winding and the rectifiers to protect various components. In the attached photo, you see an 1157 lamp being used. An automotive headlamp or even a dummy load resistor can be used. The lamps are good because they immediately alert you to a problem.
 

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Wrapped 2 turns. Through "HER107" filed + -12 volts to the "+ -Rail". The feedback resistor is set. Fig. 1 - the pulses on the first "pin" of all 21844. Fig.2 - the gates of the transistors of the lower side. Fig.3 - gates of transistors of the upper side. What's next?
 

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