Author Topic: Awesome store to get custom transformers from for dyi amps ect  (Read 2058 times)

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SantaClaw

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Awesome store to get custom transformers from for dyi amps ect
« on: November 18, 2019, 02:35:45 pm »
I just have to share my experience with this AliExpress store, as there's been a bit of bad press lately (reff that processmeter thingy)..

In short, I built myself a nice small amp, and needed a custom transformer, and oh my... I found a gem of a store..




https://www.aliexpress.com/store/911703

At just 46$ including shipping, they provided me with the above pictured masterpiece, it arrived 2 days after it was shipped via DHL express, it took 2! days from China to Northern Norway!

The seller was superb to deal with. Also it was packaged nicely. The transformer weighed 2 kg, it's 230v to +24 0v +24v and +10v all AC ofc.

I'm making myself a hybrid tube amp/preamp kit... :)

If this is in the wrong section of the forum, I'm sorry about that, but I didn't really find anywhere that fit better.
 
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Offline ETITsynthesizer

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #1 on: November 18, 2019, 03:34:41 pm »
I like this. could you provide a link to the seller?
 

SantaClaw

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Offline dom0

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #3 on: November 18, 2019, 04:01:09 pm »
The second link does not exist any more ("Sorry, the page you requested can not be found:(").

This seems to work: https://www.aliexpress.com/store/911703/search?origin=n&SortType=bestmatch_sort&SearchText=custom

However, all results seem to be "can not be found", perhaps Aliexpress is having some technical issues right now, since it doesn't make any sense that something is listed in search results, but doesn't exist.
,
 

Online edavid

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #4 on: November 18, 2019, 04:05:26 pm »
What was the total time to make your transformer?
 

SantaClaw

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #5 on: November 18, 2019, 04:10:42 pm »
It was ordered on Oct. 23, so that's 26 days, before it arrived at my door,  but I did change the specs  at some point.

Overall, not too bad considering the price and quality of the thing.

Not sure why that link doesn't work for you, it opens just fine on my end ?

 

Offline andy3055

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #6 on: November 18, 2019, 05:38:06 pm »
Great find. I wonder if they will to small ferrite core transformers for test equipment in case someone needs those obsolete Tek stuff!
 

Offline tooki

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #7 on: November 19, 2019, 12:50:43 pm »
The second link does not exist any more ("Sorry, the page you requested can not be found:(").

This seems to work: https://www.aliexpress.com/store/911703/search?origin=n&SortType=bestmatch_sort&SearchText=custom

However, all results seem to be "can not be found", perhaps Aliexpress is having some technical issues right now, since it doesn't make any sense that something is listed in search results, but doesn't exist.
All the links work for me as of right now, so I suspect it was a temporary technical problem.
 

Online voltsandjolts

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #8 on: November 19, 2019, 01:17:20 pm »
I don't see any isolation voltage ratings. Is your transformer labelled with such?
Please be careful.
 

Offline wraper

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #9 on: November 19, 2019, 01:22:39 pm »
I don't see any isolation voltage ratings. Is your transformer labelled with such?
Please be careful.
It's meaningless unless you test it yourself. They can write whatever they want. Also transformers normally don't have such rating on label.
 

Offline dom0

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #10 on: November 19, 2019, 06:00:18 pm »
I don't see any isolation voltage ratings. Is your transformer labelled with such?
Please be careful.
It's meaningless unless you test it yourself. They can write whatever they want. Also transformers normally don't have such rating on label.
I've seen "2.5 kV OK" or similar stamps on many transformers (Block, Gerth, and some others), so I think at least some reputable manufacturers are testing each unit during production, similar to how reputable tool manufacturers will test the insulation of each insulated tool (I believe they just run them through a salt water bath connected to 5 kV or so and measure the loading).

However you are right that the isolation voltage is usually not put on the label directly. Instead they put the appropriate symbols on there which indicate for what kind of use (class I, class II) the transformer is suitable.
« Last Edit: November 19, 2019, 06:02:26 pm by dom0 »
,
 
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SantaClaw

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #11 on: November 19, 2019, 06:17:03 pm »
Oh, fun, So I can electrocute myself ? That's cool :)

 

Offline SiliconWizard

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #12 on: November 19, 2019, 06:28:29 pm »
Oh, fun, So I can electrocute myself ? That's cool :)

If you think so... :-DD
 

SantaClaw

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #13 on: November 19, 2019, 06:35:53 pm »
Oh, fun, So I can electrocute myself ? That's cool :)

If you think so... :-DD

No really, it's ok, I bought a 60 amp fuse for it, and I plan on hanging the wires onto the power pole outside my house :)
 

Offline andy3055

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Re: Awesome store to get custom transformers from for dyi amps ect
« Reply #14 on: November 20, 2019, 01:52:23 am »
If you have a HV transformer from an old microwave, you could easily rig something up to test the insulation resistance from the windings to the exposed metal parts.
 


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