did I fry my transformer? [solved]

chapwithahat · 2380

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Offline chapwithahat

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on: December 22, 2014, 10:23:01 AM
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
« Last Edit: January 06, 2015, 09:49:42 AM by chapwithahat »


Offline Paul Birkeland

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Reply #1 on: December 22, 2014, 10:35:18 AM
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

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chapwithahat

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Reply #2 on: December 22, 2014, 09:34:22 PM
Dear Paul

Unfortunatrly it still blows the fuse.

Broken?

Felix


Offline Paul Birkeland

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Reply #3 on: December 23, 2014, 06:06:16 AM
Can I see a photo of the area around the transformer? 

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline chapwithahat

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Reply #4 on: December 23, 2014, 08:42:43 AM
Let me know if its not good enough.


Offline Doc B.

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Reply #5 on: December 23, 2014, 08:53:47 AM
What is the AC voltage measured at the outlet you are plugging the amp into?

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline chapwithahat

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Reply #6 on: December 23, 2014, 10:10:10 AM
220V

F


Offline Doc B.

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Reply #7 on: December 23, 2014, 10:38:34 AM
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.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline chapwithahat

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Reply #8 on: December 23, 2014, 10:59:07 AM
No worries. Will check it tomorrow my time. My meter plays funny games since yesterday.

Many many thanks for your support.
« Last Edit: December 24, 2014, 10:02:00 AM by chapwithahat »


Offline chapwithahat

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Reply #9 on: December 24, 2014, 03:25:18 AM
Terminal 1 to 2 is 14 Ohm.
I have not reattached the heating circuit.
« Last Edit: December 24, 2014, 03:31:57 AM by chapwithahat »


Offline chapwithahat

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Reply #10 on: January 06, 2015, 09:50:40 AM
Thanks for the support! I had to replace the transformer. Now it works like a charm.


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