Smoke on my power amp

the first question is "why?".  I have a guess: yo disconnected the speaker wires and they touched, shorting out the amp's "unconnected" channel.  Guess.
IS there permanent damage?  Maybe. Some, yes. Significant? we don;t know without looking. Could be nothing more than heat from an emitter resistor that began cooking. Its not good for it, but it might more or less survive. BTDT in the lab.
But the bottom line is you did something more than you think you did; and the fact that you have to ask, says "take it to someone who can check it out thoroughly".
G

Your power amp is now toast!!

+1 itsjustme. Most solid state amps shouldn't have an issue with no load. 
Dont EVEN turn it on again. It's repair shop time. 

I think what itsjustme said wasexactly what had happened. Feel so dumb.
 I am in Michigan, two hour north of Detroit. About a year ago I had it serviced in Chicago, drove five hours.
I may try there again, or I might it send to Galbo Design. 
It would be $300 both way of shipping and maybe at least $500 for service? I wonder whether it is worth while to fix it. Used price of this amp is around $1500.
Thanks for all your replies.

why....why.....why.....would you even do this is beyond me.

for someone that has been in this hobby for a while, you should know better

now you have to pay to ship the amp both ways ( or drive ) and get it serviced.

you just had this thread recently.....

https://forum.audiogon.com/discussions/should-the-power-be-off-every-time-changing-cables