repair restore classe ca300

My suggestion is to move on and forget about it.

@ozzy62 

Right now, OP has a nonfunctioning amp that he could put on craigslist and get maybe $100 as-is. Is that your advice?

That's a good thread. 

Does it go into protection mode right away every time you turn it on, or is it intermittent?

I have the monoblocks version of this amp. It's a great amp that will drive most hard to drive speakers and it is definitely worth fixing / saving imo.

The problem can either be (a) the protection circuit is detecting excessive DC offset on the output and shutting it down to protect the speakers, in which case the amp developed a fault and the protection circuit is working and doing its job, or (b) the amp is fine, but the protection circuit has gone faulty.

If you're not well-versed in electronics, it may be best to take the amp to a local tech. Classé can probably direct you to someone in your area. This is a common fault that can affect many / most amps. Good luck!

@kennymacc 

Maybe the particular CA-series you owned was a lemon? By now these amps are 25+ years old, and those that made it this far are probably neither more nor less reliable than their peers.

As you correctly point out: 

The old Classe CA series amps were wonderful sounding and extremely powerful.

That’s the salient point here. OP would be hard pressed to buy a modern amp that came even remotely close to the sound quality of his Classé with what he’d get from selling it minus what it will cost him to fix it.