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Old 20th January 2012, 09:54 PM   #1
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Default Melted my mains transformer - Where to find replacement ?

Hi, hopefully somebody can help me....

I have some small 8w 6P1P monoblocks & being a complete fool I inserted some EL84's which resulted in smelly smoke & blown fuses

Each of the mains transformers is now but everything else appears okay.

I have attached a picture showing the secondary windings but I cant find suitable replacements anywhere online... Hopefully someone will know!


Any help would be fantastic, thankyou.
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Old 20th January 2012, 10:03 PM   #2
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Look up specialist transformer companies but they might be expensive.

Or use more than one transformer to get the required voltages.
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Old 20th January 2012, 10:08 PM   #3
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If the transformer meets code there should be a thermal fuse in the windings. It is often just under the wrapper on a primary lead. These can be replaced! They are not very expensive!
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Old 20th January 2012, 10:27 PM   #4
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Quote:
Originally Posted by simon7000 View Post
If the transformer meets code there should be a thermal fuse in the windings. It is often just under the wrapper on a primary lead. These can be replaced! They are not very expensive!
Surely if the transformers thermal fuse is blown the 1a fuse in the mains inlet wouldnt continue to blow ? I dont know, just asking.


Oh and thanks Nigel, I have emailed the manufacturer to see if they can supply them but HongKong customer service can be "iffy" so fingers crossed on that one!
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Old 20th January 2012, 10:37 PM   #5
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If the mains fuse continues to blow than the transformer is bad. Sorry to hear that! If you can't get the original part you should be able to use two stock transformers to replace the one unit.
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Old 20th January 2012, 10:45 PM   #6
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Originally Posted by simon7000 View Post
If the mains fuse continues to blow than the transformer is bad. Sorry to hear that! If you can't get the original part you should be able to use two stock transformers to replace the one unit.

Gutted as I only got them today

Nevermind, thanks for your help.
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Old 21st January 2012, 07:19 AM   #7
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Check out Affordable Valve Company in Kent. They might be able to help.


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Old 21st January 2012, 08:08 AM   #8
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Looks to me like that transformer is for the heaters only. 6.3 for one set of heaters, then I'd bet that 7.6v centre tapped at 250v input gives about 6.6v at 230v, and under load you end up with the 6.3v. There must be another transformer in there for the b+??

SL windings are very good to deal with and not too dear, but it's probably cheaper to buy something pulled from an old amp from ebay....
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Old 21st January 2012, 08:36 AM   #9
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Originally Posted by woodturner-fran View Post
Looks to me like that transformer is for the heaters only. 6.3 for one set of heaters, then I'd bet that 7.6v centre tapped at 250v input gives about 6.6v at 230v, and under load you end up with the 6.3v. There must be another transformer in there for the b+??

SL windings are very good to deal with and not too dear, but it's probably cheaper to buy something pulled from an old amp from ebay....

Look again.

There are four windings. One Primary and THREE secondaries.
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Old 21st January 2012, 09:31 AM   #10
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How much room do you have to fit a replacement ?

This is a custom transformer - you have a few choices:-

1. Obtain genuine replacement.
2. Have custom replacement built.
3. Use multiple transformers.

I've found these guys really helpful but they're not cheap http://www.canterburywindings.co.uk/

If the original isn't welded together they might be able to rewind it for you - or DIY. Not impossible but VERY time consuming.

Last edited by KatieandDad; 21st January 2012 at 09:34 AM.
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