I mean, the amplifier still turns on and off sporadically. The early post I meant to say that it turned on, but, it did not remain turned on for long. I apologize for any misunderstandings.
I know of nothing that can drag the voltage down on one end of the large resistor if the large transistor is out of the circuit and the capacitor is not defective. Are you sure that there are no solder bridges anywhere on the board?
I thoroughly looked for any solder bridge, I found none. Could the toroidal power transformer have a short with in it's windings ? It also heats up abnormally as does the large power resistor.
What is the DC voltage across each of the two resistors indicate by the arrows in the attached photo.
You need to measure the voltage when the large resistor is getting hot. I'm assuming that the large transistor is still out of the circuit. If it's not, remove it.
I've measured the voltage at both of those resistors. The voltage measurements fluctuated between 2.57 V to 3.57 V. Note, the large resistor remained hot during all the measurements.
The driver transistors are in their correct position.I have not removed them. They are in their original factory placed location. I checked the resistance between collector and ground. There is indeed 10 ohms.
You stated earlier that the amp worked properly for a while. Try pushing on the board at various points and twisting the transformer to see if the the amp will intermittently work properly.
