A communication with Edcor about their CXPP100 transformer
- Thread starter Alan0354
- Start date
drew_t
Well-Known Member
I think Edcor will custom make transformers to your specifications for not a huge set-up fee. Approaching them that way and asking for a quote, rather than just popping up on their forum and asking for manufacturing information (which, from their standpoint, might have looked like an attempt by a potential competitor to get proprietary information) might have been a better way to go.
I will admit that I don't know enough about how transformers are made to know whether they are being reasonably or unreasonably tight-lipped.
I will admit that I don't know enough about how transformers are made to know whether they are being reasonably or unreasonably tight-lipped.
whoaru99
Epic Member
I can't find the email from a year or two ago, but it was a cost prohibitive set up fee when I enquired about a one-off and fairly simple custom power transformer. I asked for the specs of one of their transformers but with a secondary filament winding of 16VCT instead of 6.3VCT. Wasn't asking for a change in VA rating or anything like that.
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I know the output transformer from Dynaudio has more sections. Max is kind enough to send me one as the other one burned. I couldn't help but to open it and look:
You can see at least 10 to 12 small wires coming out and interleave between layers. That's the reason Dynaudio is so famous. Too Dyna clone do not have the impedance I want. I need 2.2K and they only have 4.3K.
You can see at least 10 to 12 small wires coming out and interleave between layers. That's the reason Dynaudio is so famous. Too Dyna clone do not have the impedance I want. I need 2.2K and they only have 4.3K.
I think the price on the Edcor is lower than shipping and import fees on the sowter or lundahl. I would not hesitate to order a pair and build an amplifier around them. ( I have ordered a simmilar pair) if you don't end up liking the way they sound, put them for sale online and order a more expensive pair. If you end up liking how they sound you may get a lot of joy out of a relatively small investment. There is no shame in listening to something inexpensive which sounds good.
whoaru99
Epic Member
No, but by the same token there is no joy if one gets too wrapped around the wheel of doubt....and I think that is a distinct possility in this case.
I have a pair of 60 watt ultralinear tapped edcor transformers, would it be helpful if I pulled the end bells and photographed the winding technique to the best of my ability?
Shadowdog
Super Member
Sure give it a try & thanks!
A fellow on another form in the EU or UK took apart a 60W PP one for 6L6 as he wasn't happy with it & found 3 layers. Their SE ones seem to get a good rep. so may have another layer or more as it's said to be more critical on the sonics of those! I guess the only way to know for sure is to look!
A fellow on another form in the EU or UK took apart a 60W PP one for 6L6 as he wasn't happy with it & found 3 layers. Their SE ones seem to get a good rep. so may have another layer or more as it's said to be more critical on the sonics of those! I guess the only way to know for sure is to look!
I took the end bells off and the bobbin design prevents me from seeing or photographing the windings without taking the thing completely apart. I haven't even started building an amp with it yet so I'm not going to risk breaking it to photograph the windings. I'll have to sneak into the abandoned hospital and power up the old X-ray machine again in order to get any photos of the windings.
There got to be wires coming out from the bobbin. Look at the picture I took of the Dynaco transformer ( again thanks to Max of Maxhifi), you see they have to pull the wires out, connect them together externally and go back into the bobbin. The reason for interleave is to split the coil to jump to different layers to interleave with the secondary. If they interleave, it has to come out of the bobbin first, wind a layer of secondary and then wind back on top of the secondary. So the end connection has to come out like this in the picture of the Dynaudio
If you don't see and tails coming out, there is no interleave.
Take a picture and post here, we should be able to tell right away.
There is a plastic bobbin which obscures my view of the side of the winding where those connections would be made.
ou might have to cut the top tape, or look carefully any budging that doesn't have wires come out.
I am not going to try and cut the plastic out of the way. I dont think there is much that you can see and I think you may be right that they do not use any more interleaving than required to get the job done. I wish I could be more helpful but I have not built an amp around these yet, so I have no idea how they will sound.
https://ibb.co/eikZKb
https://ibb.co/h44GXw
https://ibb.co/hjK5QG
https://ibb.co/eQjYCw
https://ibb.co/nQXmXw
https://ibb.co/feYRXw
https://ibb.co/hn6DCw
https://ibb.co/jCAvQG
https://ibb.co/eikZKb
https://ibb.co/h44GXw
https://ibb.co/hjK5QG
https://ibb.co/eQjYCw
https://ibb.co/nQXmXw
https://ibb.co/feYRXw
https://ibb.co/hn6DCw
https://ibb.co/jCAvQG
On the first pass, I don't think there is any more section other than the wires shown. I look at these particular two pictures, one show it's smooth, so there is no inner connection. I traced out two of the wires of the second pictures, so those are not extra wires. If I can see clearer on the other side, I can confirm. But I don't think there is extra sections.
Ask Max, he's here on this thread. He gave me that.
BTW, I did not damage the transformer, I put it back together and everything measured out.
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