smoke came from transformer

filipolaz · 21st August 2007, 06:06 AM

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.

planet10 · 21st August 2007, 06:09 AM

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

dsavitsk · 21st August 2007, 06:13 AM

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.)

planet10 · 21st August 2007, 06:25 AM

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

poynton · 21st August 2007, 06:31 AM

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

Original Burnedfingers · 21st August 2007, 10:37 AM

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.

filipolaz · 23rd August 2007, 08:16 AM

Thank you very much for the suggested solutions. All suggestions are taken into account and will be carry out step by step.

21st August 2007, 06:06 AM	#1
filipolaz diyAudio Member Join Date: Aug 2007	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.

21st August 2007, 06:09 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	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 __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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21st August 2007, 10:37 AM	#6
Original Burnedfingers diyAudio Member Join Date: Nov 2002	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.

23rd August 2007, 08:16 AM	#7
filipolaz diyAudio Member Join Date: Aug 2007	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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