Why did my amp just crash and burn ?

Bummer. What amp do you have? Was it playing while you adjusted the speaker wires? Tube amps can't be played with no speaker wires connected. A friend's Classes transistor amp has died while hooking speaker wires with amp on and nothing playing. You might have also touched the spade to chasis and caused a short. Check all the fuses. Some amps have speaker fuses and also power supply fuses.

I once had static electricity take out a hybrid tube preamp. Decided to plug it back into the system the next morning, before shipping it off for repair. The protection circuit reset and the preamp was fine.

1. Totally unhook your amp from the system and AC wall socket.

2. Check all fuses with amp unplugged from wall. 

3. Hook amp back up. Make sure the spades aren't touching anything but the proper connecter. In a bare wire hook up (no spade) 1 bare wire strand could touch the chasis and cause protection circuitry to trip.

Good luck,

aldnorab 

 I have a 2010 YBA YA201 amp. It has been a reliable versatile amp for quite some time. Even using it to route my cablebox through to TV. It has gotten plenty of use over the years. Nothing was playing through speakers at time of burn out if we can call it that. In fact just installing the cables for the very first time. The hissing sound from the speakers was the first sign something was just not right. Checked and saw the L and R cables were installed to the correct posts on the amp. Within a minute the amp just switches off and is now lifeless. 

How do I check fuses in amp , can it be completed by newbies like myself. If I find fuse is blown, are they generic and fit all brands ? If repairable, what are chances the same situation can happen again ?.

If amp , as you mentioned , could be in protection mode, how to unprotect ?

Is the amp repairable at all given all the details provide above?

It sounds like a fuse. It’s strange that the fuse can’t be accessed from the back of the amp, but it’s French, and foreign stuff can be a little idiosyncratic. Unplug it, open it up and have a look. That's a nice amplifier.