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Old 21st August 2007, 06:06 AM   #1
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Default smoke came from transformer

I have a Counterpoint 5.1 tube pre-amp, after I found the 2A fuse is broken then I put a 3A fuse to replace.

When I powered on, I saw smoke came from the power supply and smell the smoke is coming from the transformer.

Is there any suggestion, I need your help !

Thousands thanks in advance.
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Old 21st August 2007, 06:09 AM   #2
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Default Re: smoke came from transformer

Time for a new transformer, The 2A probably blew because it was on its way to failing already, The 3A (and the smoke) just confirmed things.

Pretty stinky wasn't it?

dave
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Old 21st August 2007, 06:13 AM   #3
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Default Re: smoke came from transformer

Quote:
Originally posted by filipolaz
I have a Counterpoint 5.1 tube pre-amp, after I found the 2A fuse is broken then I put a 3A fuse to replace.

When I powered on, I saw smoke came from the power supply and smell the smoke is coming from the transformer.

Is there any suggestion, I need your help !

Thousands thanks in advance.
Suggestion 1: Don't overrate fuses. They are there for a reason.

Suggestion 2: Find, and fix, the problem in the amp that blew the fuse in the first place before trying to power it up again.

Suggestion 3: Remove the power transformer and check it for shorts, etc. If it seems okay, power it up on its own (with a proper fuse) to see if it works. If it does and you have fixed the problem in the amp, reassemble it and test (with the proper fuse.)
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Old 21st August 2007, 06:25 AM   #4
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Default Re: Re: smoke came from transformer

Quote:
Originally posted by dsavitsk
Suggestion 3: Remove the power transformer and check it for shorts, etc. If it seems okay, power it up on its own (with a proper fuse) to see if it works. If it does and you have fixed the problem in the amp, reassemble it and test (with the proper fuse.)
Smoke coming out of the transformer is a VERY good sign that it has a short.

dave
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Old 21st August 2007, 06:31 AM   #5
poynton is offline poynton  United Kingdom
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Default Re: Re: smoke came from transformer

Quote:
Originally posted by dsavitsk


Suggestion 1: Don't overrate fuses. They are there for a reason.

Suggestion 2: Find, and fix, the problem in the amp that blew the fuse in the first place before trying to power it up again.

Suggestion 3: Remove the power transformer and check it for shorts, etc. If it seems okay, power it up on its own (with a proper fuse) to see if it works. If it does and you have fixed the problem in the amp, reassemble it and test (with the proper fuse.)
Suggestion 4: Keep the lid on and don't let the smoke out. Everyone knows old amps are powered by smoke!! If that fails , replace the transformer and check the rectifier and caps.

Andy
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Old 21st August 2007, 10:37 AM   #6
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Put in or a smaller value fuse back in until the problem has been found.

Use a variac to power it up or a light bulb in series with the power cord. Sometimes one needs to power it up to find the problem.
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Old 23rd August 2007, 08:16 AM   #7
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Thank you very much for the suggested solutions. All suggestions are taken into account and will be carry out step by step.
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