I was Recently given an ADCOM 5450 car amplifier to repair. Amp goes into protection when powered on. So far, I’ve found a bad diode, two small resistors, and 2 damaged IRFP240’s.
I’m trying to determine the correct value and wattage of the metal oxide (flame proof) resistor connected to each of these transistors.(Please see attached pics) I believe these are .1 ohm but wanted to confirm this? I also need the wattage, I believe it’s based on physical size but I’m still unsure.
I believe Perry confirmed in a previous thread, same amp but different transistor, that I will only need to replace the bad IRPF240’s and not all of them, due to the class A/B design. Please confirm that this is true for these transistors as well?
My last question, can I replace the IRF610/IRF9610’s found in this amplifier with a more durable, powerful, or more modern transistor combination? I was considering the IRF640/IRF9640 combination but I’m unsure if these will be compatible with the rest of the design?
Thanks for any help and assistance
I’m trying to determine the correct value and wattage of the metal oxide (flame proof) resistor connected to each of these transistors.(Please see attached pics) I believe these are .1 ohm but wanted to confirm this? I also need the wattage, I believe it’s based on physical size but I’m still unsure.
I believe Perry confirmed in a previous thread, same amp but different transistor, that I will only need to replace the bad IRPF240’s and not all of them, due to the class A/B design. Please confirm that this is true for these transistors as well?
My last question, can I replace the IRF610/IRF9610’s found in this amplifier with a more durable, powerful, or more modern transistor combination? I was considering the IRF640/IRF9640 combination but I’m unsure if these will be compatible with the rest of the design?
Thanks for any help and assistance
