did I fry my transformer? [solved]

[chapwithahat]

Dear Forum Members
I build and checked my crack and after I turned it on the transformer had a bit of smoke coming out. I turned it off but now it instantly blows the fuses.

Any tips how to check if the transformer is broken?

Thanks and best regards
Felix

 

[Paul Birkeland]

Hello Felix,

The first thing I would do is to remove the red/black twisted pair of wires from power transformer terminals 4 and 5.  Next, remove the red wire that goes from power transformer terminal 9 to terminal 19 at either end.

This will unload your power transformer, and you can pop a fresh fuse in and switch the amp on.  If the fuse blows, let us know, if not, we'll restore each load individually to see where the fault is.

-PB

 

[chapwithahat]

Dear Paul

Unfortunatrly it still blows the fuse.

Broken?

Felix

 

[Paul Birkeland]

Can I see a photo of the area around the transformer? 

-PB

 

[chapwithahat]

Let me know if its not good enough.

 

[Doc B]

What is the AC voltage measured at the outlet you are plugging the amp into?

 

[chapwithahat]

220V

F

 

[Doc B]

Just want to let you know I'm not ignoring you. I am conferring with my guys about the next step. In the meantime, if you could measure the resistance from power transformer terminal 1 to power transformer terminal 2 that would be helpful.

 

[chapwithahat]

No worries. Will check it tomorrow my time. My meter plays funny games since yesterday.

Many many thanks for your support.

 

[chapwithahat]

Terminal 1 to 2 is 14 Ohm.
I have not reattached the heating circuit.

 

[chapwithahat]

Thanks for the support! I had to replace the transformer. Now it works like a charm.