This amplifier arrived at the workshop with two of the drivers open from base to emitter, one negative and one positive. The numbers of the transistors are: A1837 and C4793, I proceeded to change them for originals, not generic, but when turning on the device one of the negative transistors gets quite hot, I replaced the two power that are connected to said driver, but the same. Before that I took the time to check one by one and raised the components associated with the whole output, all good. Please wait for suggestions, thanks.