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Old 20th January 2011, 05:30 PM   #21
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I've seen both methods of construction. I'm just trying to come up with some explanation as to where the heat is coming from.

A saturated core may get hot but this is the opposite phenomena that this thread is investigating.

I'm merely suggesting that the cause of the heat may be at the centre of the windings so that it is not felt on the outer copper layers.

Last edited by Andy5112405; 20th January 2011 at 05:33 PM.
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Old 24th January 2011, 03:33 PM   #22
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I already fixed a 12 v fan from a computer psu,i don't know if it will help,i haven't pushed it yet.
The fan did the job!It no longer overheats...even after pushing it hard the whole afternoon.The fan runs continuously,not temperature controlled.It isn't noisy either,i lubricated it real good...even if it was noisy,this bass is way too loud for it to be heard. I hope i wont get thrown out of the college hostel!
Thanks for your replies.Regards.
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Old 24th January 2011, 03:48 PM   #23
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the fan should make a good job of exchanging the hot air inside the case.
That will effectively reduce the surface temperature of the transformer.
Have you any idea of how hot the interior of the transformer is?
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Old 25th January 2011, 05:41 AM   #24
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The cooler the surface,the faster the interior heat is conducted to the surface.I don't expect the interior to be hotter than surface without the fan.
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Old 25th January 2011, 05:44 AM   #25
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now you're talking, good job......
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Old 25th January 2011, 10:03 AM   #26
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Originally Posted by xeclipse View Post
I don't expect the interior to be hotter than surface without the fan.
I don't agree. But there again I don't claim to know the interior temperature nor do I know why you are not searching for the reason for the overheating.
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Old 25th January 2011, 01:39 PM   #27
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Aopo
logies for the slow reply, busy with work.
If you can't find the A1943, then you can use the MJL21194G/MJL21193G pair. Every bit as good as the C/A pair, and available from Farnell, amongst others.
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Henry
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Old 25th January 2011, 06:41 PM   #28
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I don't agree. But there again I don't claim to know the interior temperature nor do I know why you are not searching for the reason for the overheating.
Trafo overloading?Shorted winding?...I can't tell.The rails remain at +/-49.7v even when pushed hard. I know am pushing my luck with this former.If it fails,i wont rewind it,i'll modify a pc psu.

Quote:
Originally Posted by toprepairman View Post
Aopo
logies for the slow reply, busy with work.
If you can't find the A1943, then you can use the MJL21194G/MJL21193G pair. Every bit as good as the C/A pair, and available from Farnell, amongst others.
Regards
Henry
Those were my first choices,i couldn't find any.Mj15003/4 are all fakes...nothing comes easy to a diyer in Kenya,apart from good ol' stuff from a radio shack.
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Old 26th January 2011, 12:53 AM   #29
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just go on with what you're doing, noobs have way of over racting, i know, i was there before....

i do not see anything wrong with your traffo if you are able to use it.....no matter what others say.....just enjoy the music....

be sure your amp is fused and you have no worries.....
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Old 26th January 2011, 11:12 AM   #30
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Quote:
Originally Posted by xeclipse View Post
The cooler the surface,the faster the interior heat is conducted to the surface.I don't expect the interior to be hotter than surface without the fan.
The interior is always hotter than the surface. The heat is generated inside, and then conducted to the surface where you can take it away. The very reason that heat escapes from the outside by whatever means, means that the outside is always cooler than the inside.
Anyway, transformers often run fairly hot; but if you can't keep your fingers on the surface for 10 secs than it is close to 50 degrees Celcius and that's not really a healthy situation.
You can put in fans but that's just hiding a problem that'll blow up sooner or later, maybe literally.
So you need to fix the problem and not just the symptoms.

jan didden
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