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EDCOR XPWR066-240 ok with 230V? (Read 448 times)
holg
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EDCOR XPWR066-240 ok with 230V?
12/11/22 at 16:31:27
 
Hi all, I am preparing my first ZKIT1 build at the moment, doing a lot of parts research and reading on this forum for now. Very exciting.

One question I had but couldn't yet find a definitive answer on is whether I can use the recommended EDCOR XPWR066-240 transformer without problems with 230V input (I'm in Europe)? Do I need to adjust for this in another way?

It seems some people for some reason or other use different transformers, but I am not knowledgable enough to judge what works and what doesn't…
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #1 - 12/12/22 at 10:58:59
 
Hi holg,
here is Frank from germany and i use the Edcor XPWR066-240 for my one in germany without any modification and it works fine!
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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #2 - 12/12/22 at 19:43:15
 
Hi Frank! Thank you for your quick and helpful reply!
Did you do the ZKIT1 “standard build” or did you do things like the Hazen mod or others I don’t know about yet? What tubes are you using? Just curious.

Either way it is very reassuring that the recommended Edcor works fine so I might just as well go ahead and order one next week. I’m located in Germany as well. Really looking forward to building this amp.

Holger
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #3 - 12/12/22 at 20:05:06
 
Hi Holger, i just finished my tube amp last weekend without any mods. Attached some pictures, but the housing is still in work. I can send you tomorrow the tubes i use. You also can contact me via WhatsApp 01726997666 or give me a call. I use the amp with my Maggies SMGa and it work perfect. Frank


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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #4 - 12/12/22 at 21:25:40
 
Very kind of you Frank, thanks! Also, great photos. What do you plan to do on the housing? The cage actually looks pretty cool…

I am still not sure whether to do point-to-point wiring, like you did. That was the initial idea, but although I feel pretty comfortable soldering boards, I never did point-to-point … and really don't want to screw this up by not knowing better.

By the way, did you get your transformer from don audio, too, or did you find another distributor for Edcor here?
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #5 - 12/13/22 at 08:25:47
 
Hi Holger, yes i bought the transformer and other things from Don-audio, and the rest direct from mouser online shop.
It was also my first point to point job but it is not so complicate as you think. If you do point to point you are much more flexible to the housing and the final design. I spent a lot of time to create an overview for the right position of all components an you can use a central ground point!



I want to paint the chassis in dull dark grey and use old wood panels for the side.
I use tubes as you can see in the picture, but not the siemens one and you can get all of them from ebay. Good luck - Frank



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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #6 - 12/13/22 at 22:45:07
 
Your amp is going to look incredible in dark grey and old wood – be sure to upload photos when you are done.

Your hand drawn schematic makes everything a lot easier to understand, especially together with the photo of your wiring. Will study it in detail over the next weeks, but seems doable. Still a bit concerned about grounding and safety issues but will study and learn more about necessary measures.

Thank you Frank!
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Mannytheseacow
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #7 - 12/14/22 at 03:05:07
 
Very cool, Frank! I like the look of the cage/grill chassis.
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #8 - 01/10/23 at 15:05:37
 
Hi Holger, i wish you a good start to the new year Smiley
Here are the latest pictures from my ZKIT1 DIY housing. Nice looking and wonderful sound on my Maggies (SMGa).
Frank



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Lon
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #9 - 01/10/23 at 15:10:10
 
Nice looking build, unique look. I bet it sounds "airy." Wink
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4krow
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #10 - 01/10/23 at 19:44:31
 
Beautifully unique. Your work is also fine. Does make me think about a project though. Tell me, were there any surprises when building as far as the housing goes? Holes not lining up, bending not the way you would like, etc?
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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #11 - 01/10/23 at 21:28:57
 
Frank, happy new year to you as well!
This looks absolutely fantastic – congratulations on your build! Absolute beauty.

How did you paint your transformers, and I assume the positioning of these as they are works just fine without humming?

I started gathering parts for my build last week, mainly the Edcor XPWR066-240 (already arrived), and am doing more research right now about how to do grounding properly and how to layout everything (that's why I am asking about your transformer positioning).
Remember that I have never built an amp before so I am taking my time to do things as well as I can.
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #12 - 01/11/23 at 08:21:39
 
@4krow:
Hi, at the beginning i had no plan what my housing should look like. I start searching my storage for a metal plate and i found the old plate with square holes in. Fist i tested the equipment mounting points of the transformer and it works fine, for more flexibility i used some rubber distance slices. The diameter of the holes (square 8mm) works perfect with all components to fix. For the bending I used a round wood stick with a diameter of 2cm. Nothing complicated on this built, but you need to plan all distances, also the distance of the electronic components inside for soldering. So I made the plan an place the components for testing on the chassis before soldering. Greetings from Germany - Frank
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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #13 - 01/11/23 at 08:40:10
 
Hello Holger, thank you for the flowers  [smiley=dankk2.gif].
I simply unscrewed the blue sheet metal from the transformers and then painted them. Mounting the transformers with rubber spacers makes mounting a little more flexible. Since there was no humming before, you could also omit them. As I have an education as an electrician, it was clear that from an electrical point of view it is imperative to use a central ground point in order to avoid hum. So my offer still stands you can call me directly! VG Frank
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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #14 - 01/11/23 at 20:43:32
 
Hi Frank – sounds good! My research so far has also lead me to wanting to use a single grounding point, glad to hear that's what you did and the way to go.
Thanks also for your kind offer to contact you directly – give me a little time to try to figure some things out on my own, but I will gladly get back to you with my plans to have a look in case I screwed up somewhere  :o
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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #15 - 01/18/23 at 20:37:56
 
Frank (or anyone else, of course!), can I hijack my own thread and ask you a quick question about the output transformers, too?

In the parts list it recommends to use the Edcor GXSE10-6-8K (“10W, single ended tube output transformer for 8K Ohms to 6 Ohms.”) output transformers.

My speakers are 8 Ohm speakers – wouldn’t it make more sense to use the GXSE10-8-8K output transformers with 8 Ohms instead of 6 Ohms output?
Are the recommended 6 Ohms some sort of compromise that works with 4 as well as 8 Ohm speakers?

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Frank Troeger
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #16 - 01/20/23 at 10:49:04
 
Hi Holger, for my understanding it is important to have the same impedance of the amplifier and the speaker. Most of the tube amps are using transformer with more than one output > 0 - 4 Ohm - 8 Ohm, 0=minus and two outputs. If you don`t do this your transformer should have the same impedance - GXSE10-8-8K is the solution for the 8 Ohm speaker. I use the 6 Ohms with my Maggies 4 Ohm input and it works. I hope there will answer also a specialist  :-)
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bobc
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #17 - 01/21/23 at 19:15:48
 
I read somewhere on this site the UFO transformers for se84 are 6.6k impedance with dual 4/8 taps. I’ve used both 6.5 k transformers as well as the recommended 9.8/6 speakers ion various iterations. I liked the 6.5k transformers, probably because I had them wound for me.

The concept is reflected impedance via the transformer/speaker to the tube.

The 6.6k into 4/8 apparently has same reflection as 9.8/6 but I haven’t done the math. Enjoy!
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holg
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Re: EDCOR XPWR066-240 ok with 230V?
Reply #18 - 01/23/23 at 21:08:54
 
Thank you both, Frank and Bob. After contemplation, some rambling follows:

I'm still not quite sure what the best "real" primary impedance is, but from some research and from what Steve Deckert wrote here (https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1464381300/3), it sounds like in your case Frank the real primary impedance would be more like 5.3 kOhms when using the GXSE10-6-8K with 4 Ohm speakers.
In the same way, Bob, it makes sense that 6 Ohm speakers plugged into the 4 Ohm tap of a 6.6 kOhm transformer would really be more like 9.8 kOhm to the tube.

Steve actually makes it sound like the best solution for 8 Ohm speakers would be to use transformers with an even higher primary impedance than 10 kOhm and secondary impedance higher than 8 Ohm to pull the real primary impedance back down again (e.g. fictional example 12k primary to 12 Ohm secondary would only be 8 kOhm when connecting 8 Ohm speakers. At least that's the way I understood it.

Since I am lacking actual knowledge and can't just try different output transformers, I will probably just try finding one in the Edcor GXSE series that's wound for 8 Ohms secondary with a primary in the 5k-9k range… still not quite sure what difference this makes in terms of sound.  :o
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