2. amps-preamps
  3. 153960-1009

Smoke on my power amp

I was listening the music with the right speaker wire detached to listen to the left speaker alone. The speaker wire was still attached at the amp side. My preamp does not have the balance knob.
After 20 secs or so, there was a smoke on my power amp.
I quickly turn off the amp.
Once smoke comes, would it be safe to turn it on again? I wonder whether it is permanently damaged.
Is it not safe to listen to the music with the speaker wire detached from one speaker but still attached on the amp side?
My amp is Plinius SA 102.
Any comment?
thx


ihcho
cakyol's avatar
cakyol
940 posts
 
Not good :-(

When you say "speaker wire detached", do you mean BOTH the wires were uplugged from the right terminals or only one ?  Is it possible you could have shorted the speaker output ?  Typically, the amps should be protected against speaker shorts but nothing is guaranteed.
cakyol's avatar
cakyol
940 posts
 
You may have to send it to New Zealand....
almarg's avatar
almarg
9,670 posts
 
To illustrate what I was referring to in my previous post, in the first of the following photos I’ve uploaded the two transistors with the grayish blobs straddling two of their leads are shown surrounded by a red rectangle. The second photo is a blowup of that area:

https://www.flickr.com/photos/32959731@N04/49419393081/in/dateposted-public/

https://www.flickr.com/photos/32959731@N04/49418924433/in/dateposted-public/

Although the limited resolution of the original supplied by the OP makes it hard to tell, I wouldn’t be surprised if those transistors were what smoked.

Regards,
-- Al

gdnrbob
4,481 posts
 
@ihcho ,
I did the same thing on my old DNA-1-inadvertantly, of course.
The only thing that happened was that the fuses blew.

I would be surprised that your amp wasn't equally protected.
Did any fuses blow?
Bob
gs5556
1,241 posts
 
Al, I agree. I see a collector to emitter short from what looks like heat damage. The smoke is from the case melting (concave damage in middle to right).
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