Classe not working

Check to see if the switches on both sides of the speaker posts are in the correct position. You might also flip them back a forth a dozen times or so to make sure they are working right. I would check the fuse on the rear panel and pop the top off and look for any internal fuses.

Recently, we were triying to connect a cable jack but immediately,

Are you referring to the power cable or source cable?

How long the amp had been sitting on the shelf?

Please clarify those to get more clear answer. THANKS.

Thank you for your response dill

We had checked the fuse on the back and after your comment we opened the amp to check the internal fuses. We found two but they were covered by a white capsule, unlike the one on the back, which had a transparent capsule that enabled us to see the wire inside. We’ve planned to buy new ones and see if that solves the problem.

Hi czarivey

Sorry i forgot to say that we connected the cable to the preamp. I don’t know if those things are related but the problem took place immediately after.

I would say almost 15 years.

Thank you!

Now I know the problem.

After 15 years you should slowly bring it to operational voltages using variac otherwise stress is too large and can damage circuit components.