ADA Microtube 100 smoking

[rcknrllmn]

Hi,

   The other day I turned on my Microtube and white smoke started coming out of it.
I turned it off immediately & disconnected it.  It has been a while since I used it. 

  I hope it is repairable.  Does anyone have any idea what it could be?

Thanks
Tom

[MarshallJMP]

Have you opened it up? if not open it and take some pics so we can see. Could be a lot of things.