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Bad transformer rewinding
Bad transformer rewinding
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Old 17th May 2006, 10:21 PM   #11
VEC7OR is offline VEC7OR  Lithuania
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Bad transformer rewinding
I think that its now worth it.
Time you spend rewinding it will probably buy you a new one, especially it itsa small one.
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Old 17th May 2006, 10:55 PM   #12
anatech is offline anatech  Canada
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Bad transformer rewinding
The thermal fuses have opened.

Question is ..... why? I know, do you?

Give Denon a call and price those transformers. Do you have the part number printed on the outside? Could be 233 .... and so on.

-Chris
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Old 18th May 2006, 07:07 AM   #13
AndrewT is offline AndrewT  Scotland
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Hi,
Is it worth repairing?

The Orientals started the trend of throwing things away after six months by releasing the new super dooper version.
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Old 18th May 2006, 07:18 AM   #14
ostie01 is offline ostie01  Canada
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Part number on transformer are:

2336188005

TKP0278-E93

6 742

Where is located the fuse on a transformer

Since it's dead. just begun to open it up to see inside, not finish yet but I'm on the way.This is weird, no sign or smell of burning
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Old 18th May 2006, 07:58 AM   #15
AndrewT is offline AndrewT  Scotland
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Hi,
if a thermal breaker is fitted it will more likely be under the secondary winding.
If the windings are on separate spools, it could be under the primary insulation or buried in the primary winding.

These thermal fuses are not intended to be easily repairable/replaceable due to the damage to insulation that is likely at the high temperature that causes the thermal to eventually trip.
Another case of throw it away ideology.
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Old 18th May 2006, 08:46 AM   #16
richie00boy is offline richie00boy  United Kingdom
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Bad transformer rewinding
Just get a new one. You will damage some of the laminations trying to get them apart, if you manage at all. The whole thing is soaked in varnish so must be solvent dipped to clean it off you you will simply be fighting all the way and ruin it.

And if the secondary has been wound over the primary it's lot of work, you'll probably need a helper if you don't have a winding machine as well.
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Old 18th May 2006, 09:08 AM   #17
ostie01 is offline ostie01  Canada
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WOW. much more complicated than I thought. Wrote an e-mail to denon to have the cost for two brand new transformer. Will depend on the price, else will salvage the 3 amps. One transformer still good so I have one power amp at 120w. and two board which I could find an old transformer with approx. 45v 0 45v to go with the two remaining boards. As always, thanks for your help.
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Old 24th July 2017, 09:34 PM   #18
ampexperts is offline ampexperts  United States
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In my experience, the hardest part is taking apart the core so one can get the bobbin assembly out for rewinding. I gather that takes special tools which I don't have.
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Old 24th July 2017, 10:53 PM   #19
mchambin is offline mchambin  France
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Quote:
Originally Posted by Bazukaz View Post
Having no ideas how toroid winding machines look like....
The machine is mosly clever.
One can build this kind of machine from a bicycle wheel rim.
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Old 25th July 2017, 03:40 AM   #20
anatech is offline anatech  Canada
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Bad transformer rewinding
This thread is from 2006!

-Chris
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