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Help with what's wrong with my 300b amp?

Hi all tube knowledgable Goners!
I've got a Consonance 300b SET integrated amp with the power coming through my Equi=Tech ET1R with the Si option -(super-isolator option)
The breaker on the ET1R kicked off and I then plugged the amp directly into the wall, thinking my problem was the ET1R, but NOooooo.....that was NOT the problem.
When I powered on the amp, all the tubes EXCEPT the power tubes (the 300b's) came on. While observing the lack of response from the 300b's, the center-located transformer? (if that's what's under the center round thing?) made an electrical "cracking & popping" noise and I think I saw some sparks. I immediately flipped the power switch OFF. I see NO reason to repeat the above exercise!
Can anyone tell me, from the description that I've given, the various possibilities of what could be wrong with, and the damage done to this amp? And any suggestions on who and where to get it repaired, and the possible costs?
Your comments and help are appreciated!
Thanks
myraj

Showing 1 response by jax2

jax2
3,031 posts
 
You did not mention, but were you changing power tubes at the time? Did you remove one of the 300B tubes and replace it? If so, some of the less thoughtfully designed tube outlets allow you to plug in the larger 4-pin tubes in the wrong orientation, though it may be visually clear what the orientation should be. If you did that with one or more of your 300B tubes the results may be similar to what you described and you would have fried a resistor. If this is the first time you plugged these amps in, or if you just swapped tubes, carefully check the orientation of the pins in those 300B tubes.

Marco
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