Bearr38, this is the first time I'm seeing this thread. if both mosfet fuses are blowing, that leads me to believe your problem is with the speakers. I don't understand though why the mosfet fuses would blow under extreme load conditions but not the rail fuses for the output transistors.
BTW, Classé has a specific procedure for replacing the mosfet fuses that includes discharging the main power supply caps with a 100W incandescent bulb before doing anything in the amp, including replacing the mosfet fuses. Failure to do this risks damage to the mosfets. You also need to ensure that replacement fuses fit tightly in the fuseholder, crimping it a little if necessary. Loose mosfet fuses can translate into distortion on top of the audio signal.
I have service manuals for the CA-200 and CA-201. The older CA-200 manual is very basic, and does not have troubleshooting steps. The service manual for the almost identical CA-201 does have troubleshooting steps which you should find helpful. The steps are basically the same for all Classe legacy models. PM me if youw copies of the manuals.
BTW, Classé has a specific procedure for replacing the mosfet fuses that includes discharging the main power supply caps with a 100W incandescent bulb before doing anything in the amp, including replacing the mosfet fuses. Failure to do this risks damage to the mosfets. You also need to ensure that replacement fuses fit tightly in the fuseholder, crimping it a little if necessary. Loose mosfet fuses can translate into distortion on top of the audio signal.
I have service manuals for the CA-200 and CA-201. The older CA-200 manual is very basic, and does not have troubleshooting steps. The service manual for the almost identical CA-201 does have troubleshooting steps which you should find helpful. The steps are basically the same for all Classe legacy models. PM me if youw copies of the manuals.