Hello! I have a big question and request for all those who know and are willing to help me. I own a Pass Labs X250.5 amplifier (with IRF9240P and IRF240P), which had some burnt final transistors. It was fixed, now it works, but I want to restore the bias to the optimal values from the sound point of view. Since there is no Pass Labs accredited service in my country, I have to deal with the problem myself. I adjusted the DC offset to zero, both between the speaker terminals and between the + terminal and the case, the values are now around 0 mV. I also adjusted all 4 bias voltages so that they do not exceed 60 mV. Since I hear that the sound is not at such a high quality standard as it was at the beginning, I want to bring it back to the same optimum factory condition, to audiophile demands. Specifically, I would like someone to tell me what the optimal bias values are in thermal equilibrium conditions, with the cover mounted, and without input signal. Also, I want to find out which of the 24 pieces of 0.47 ohm resistors I have to measure. Thanks in advance for the answers. I would like help, if I am not asking too much, even from Mr. Nelson Pass. Thank you very much! Catalin
