| curva |
I can confirm it works that way, there is also a document on atrim's website... too bad I didn't see it on time...
at least with the mains they go standard, brown, white, black, pink...
http://www.antrimtransformers.com/a....php?PageId=643
PS: sidenote, don't forget to mount some sort of copper foil/plate over the digital chips and then ground them with a wire. very important, go try with and without, you'll see what I mean. |
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| jonclancy |
Top link, thanks!!
How's your DAC sounding?
Jon
I'm meltiiiiiiiiiiiiiiiiiing! :cool: :hot: 30 Deg C OAT |
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| curva |
I'm happy with it, nice bass and all, but a bit soft for my taste with some tunes... I have to play with the parts some more...
(for now BG 0.1 for decoupling, BG 100uF std for analog, bg 4.7 for output, mica for C124/121, dale/rikens eveywhere where important...) |
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| t. |
Too soft ehh?
Try Caddock TO20 for I/V, TDA1541S2 double crown, Reclocker (a must) 100nf Multicap RTX for decoupling of -15v;)
I use 470R caddock,3n3 polypropylene and 220nf polypropylene (low inductance) for the CS8412 filter
Mine sounds :hot: the dynamics are the best I have heard from a cd source.
Also are you using Panasonic FC's for the large value caps in the PSU's before the regulators? I tried the FC's but they klled the sound, the bass was almost flabby so I now use standard types instead of low esr types.
All the other caps are BG's |
|
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| buddha |
| Is anyone interested in joining another group buy for 10 more of these toroidals? |
|
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| nullspace |
| I'd be interested in one. It has to be cheaper for me to get one shipped from the UK than get a custom wound one in the States. |
|
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| buddha |
| Hi, the primary's 230v |
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| nullspace |
| That's unfortunate. I thought it was dual 115v, for international use. |
|
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| buddha |
| Hi nullspace, I just went to double-check and you are right. I was wrong. It is 2 x 115v :) |
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| nullspace |
| Excellent. If we could just dig up 8 more souls... |
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| Cobra2 |
I could take one!
Arne K |
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| Andypairo |
Count me in for one.
Cheers
Andrea |
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| nullspace |
| We have four now, with six to go... |
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| buddha |
Great.
Nullspace - just wanted to check - are you aware this could be quite expensive to ship to the US?
BTW, qty 10 gives the biggest discount per person, but discounts are still available if we have to go with less than 10. |
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| nullspace |
WTF? I checked out UPS to see what shipping might be to 08077 from London for a 3kg. package and it came out to something like 60GBP, more than a hundred bucks to me. I thought it would around $30-40, which I can live with - apparently not.
That's nuts. Is there a cheaper alternative, otherwise I'll have to withdraw my name.
John |
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| buddha |
| I think we would get Antrim to ship directly (from Northern Ireland) - there are definitely cheaper options than UPS. |
|
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| nullspace |
| If I can assume that the transformers are still going to be around 45GBP, than I can probably cough up another 25GBP or so for shipping. That still gets me in for just a small premium over VM. |
|
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| nullspace |
| Ah, that's probably close enough... I'm still in. |
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| curva |
Is this the same traffo that was already served in this group buy?
I took one and it's so good I might just wanna get another one for building yet another DAC ;) |
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| buddha |
| Yes, curva the same, but the engineer told me he would want to make a couple of optimisations to the locations of the windings and also correct the printing error on the label :) |
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| Whit |
| I'd like to get one.:D |
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| buddha |
cool, so now we have 6 as below:
buddha - uk
nullspace - usa
cobra2 - norway
andypairo - italy
curva - germany
whit - usa
just need a few more to come out of the woodwork :smash: |
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| Cobra2 |
I would want 2, or maybe more...
Arne K |
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| buddha |
| The price is more or less the same as previously - about £36 (ex vat) |
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| ghammond |
Hi Guys,
Nice to meet everyone.
This looks like an excellent deal. I'd like to order one of these transformers.
Just let me know who, how and when to pay.
Cheers,
Grant. |
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| buddha |
Hi! Great. This takes us to at least 8, depending on whether Arne K wants more than 2.
I think I will ask Antrim to recalculate the price for 8 or 9. |
|
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| nullspace |
| Hi Buddha -- Any word yet from Antrim on cost for <10? Thanks, John. |
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| buddha |
Hi, yes they took a little while to come back to me as follows:
- identical to the previous run -
10+ £41.25
9+ £45.00
8+ £51.00
They can arrange individual shipment, too. I will need to speak to them about the best way to collate payment.
Personally, I would like to get it done before Christmas so maybe we should close out interest in 2 weeks time?
Can anyone interested please re-confirm by Friday Nov 18? |
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| nullspace |
I hereby officially reconfirm my participation in this GB.
Regards, John. |
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| ghammond |
I'm still in too.
Grant. |
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| Andypairo |
Still interested.
Cheers
Andrea |
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| Cobra2 |
Still interested. (in 2 pc.).
(but out of cash for another week or so...)
Arne K |
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| nullspace |
Hey Buddha --
What's the latest? It looks like we topped out at 7 confirmed. Does that leave us one short of the minimum 8?
Any others want to help a brother out by buying a transformer?
Regards,
John |
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| ctleake |
| How much would this Antrim Transformer cost should you interest enough subscribers? Are we talking a custom Transformer with the eight secondaries necessary for Pedja's DAC? |
|
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| ctleake |
| Blast, I didn't read enough of the entries to see the quoted price. Yes, I'm interested at < £40. I'm intending to use Thorsten's Analogue Stage requiring secondaries of 6.3V/155mA (ECC88 heater) and 100V/12mA (CCS anode load) but I guess I can sneak in seperate Transformer from Maplin for that. |
|
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| Andypairo |
| quote: | Originally posted by ctleake
Blast, I didn't read enough of the entries to see the quoted price. Yes, I'm interested at < £40. I'm intending to use Thorsten's Analogue Stage requiring secondaries of 6.3V/155mA (ECC88 heater) and 100V/12mA (CCS anode load) but I guess I can sneak in seperate Transformer from Maplin for that. |
It seems that it will be slightly more (about 41£ if we get 10).
However, it seems that Buddha (who seemed to be willing to take the lead of this group buy) disappeared...
As someone suggested in the first pages of the thread there is a eventual alternative, a member here (Lupulroz) runs a romanian-based enterprise called "Rockna". I already bought some toroids from him and they were well done. Not to talk about the difference in price.... should I ask him a quote?
Cheers
Andrea |
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| ctleake |
| Thanks for letting me know Andypairo. Yes, I should very much like a quote from your Romanian, please. |
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| Andypairo |
This is the post I was referring to. I will email him and will ask if the conditions can be the same.
Regards
Andrea
| quote: | Originally posted by jonclancy
Hi All,
diyAudio user Lupulroz has kindly offered the following: :)
> Hello,
> if it's any help - I can do your transformer for 25 euro + shipping.
> I made a lot of custom requests for diy-ers from the forum.
> Orientative prices at http://www.rockna-line.com/toroids.htm
>For potted core & mounting kit included price is 30 euro / piece.
>Shipping to UK for 15 pcs. (approx. 30 kg package) is 140 euro.
Shipping to a single UK destination is the same price as would be for individual delivery from Antrim in the UK - so there will be additional postage to pay. I can see how much a 2kg parcel will be for the UK and EU. Don't forget to add VAT to all prices quoted in this thread - UK Customs will add it to any imports and it will be charged by any UK-based company.
Have a look at the Rockna site, have a think about the sums and let me know your thoughts.
Cheers
Jon |
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|
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| ctleake |
| You're a star Andrea. I hope I can return the favour some day. |
|
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| jean-paul |
| How did things develop ? |
|
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| ctleake |
| I haven't heard from Lupulroz of Rockna yet. I suppose I could just email them direct at Rockna, reminding them of Pedja's Transformer spec... |
|
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| Andypairo |
I emailed at Rockna, waiting for a reply.
Cheers
Andrea |
|
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| jean-paul |
If possible please specify the secondary windings not at the highest voltages as the overvoltage will only end up in heat.
| quote: | Originally posted by jonclancy
Transformer TR1 secondary windings
#nominal voltage current rating actual circuit requirement
1 7-9V 1A 20mA
2 7-9V 1A 13mA
3 7-9V 1.5A 27mA
4 7-9V 1.5A 37mA
5 21-22V 2A 40mA
6 17-18V 1.5A 15mA
7 17-18V 1.5A 15mA
8 7-9V 2A optional, for a reclocker
The 7-9V secondaries I would like to specify as 9V. The 21-22V as 22V, and the 17-18V as 18V.
In summary, five secondaries of 9V, two of 18V and one of 22V. I would require the toroid potted and banded as well, please.
|
Secondary winding 1,2,3,4 and 8 can easily be 8V, winding 5 can be 21 V. To make things cheaper all windings can be rated 1 Ampere as the actual current requirements are quite low. Overspeccing is OK but this is extreme.
edit: I lack time at the moment but I think the 21 V can be lower than 21 V too. |
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| Andypairo |
Hello J-P
I also had noticed the extreme overspeccing.
I can ask a quotation with reduced overspeccing, maybe adding a supply for a tube output stage (as the one suggested by Thorsten)... what do you think about it?
Cheers
Andrea |
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| jean-paul |
| What extra voltages ? There is nothing against it as it will make the project more versatile. |
|
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| Andypairo |
Hello,
since Thorsten's last tube I/V uses a 100V b+ and a single section of a E88cc per channel a 100V 50 mA and a 6.3V 1A could be added.
http://www.diyaudio.com/forums/show...4817&highlight=
But to make it more "universal" the 100V could be doubled....
I also made a request to some italian transformer makers for a quotation with the following specs:
Primariy 2x115 V
Secondaries:
1- 8V 1A
2- 8V 1A
3- 8V 1A
4- 8V 1A
5- 21V 1A
6- 17V 1A
7- 17V 1A
8- 8V 1A
optional secondaries
9-100V 50mA
10-6.3V 1A
I hope they will reply with good news.
Cheers
Andrea |
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| jean-paul |
Excellent. I am in.
Just a sidenote: for 100 V DC ( with use of CCS ) or 75 V DC with a coil a secondary winding of 80 V 50 mA ( or 100 mA ) maybe is a better choice ?? The current draw is about 25 mA for both channels. |
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| Andypairo |
I wanted to keep some margin for a regulated B+ but re-thinking about it with a CCS this is not needed... probably 80V is a wiser choice.
Just one HV secondary (100mA) or 2*50mA (so you can have both doubled voltage or doubled current?)
Cheers
Andrea |
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| marco70 |
Hi, still in time for a transformer ? my Pedja's DAC boards (DAC+reclock) are still waiting for in their box....so sad :-(
Thanks
Marco |
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| ctleake |
| I hate to dampen anyone's enthusiasm, but Lupulroz of Rockna has not replied to me - maybe he has to Andypairo - and Buddha, who was coordinating the group buy has, I guess somewhat inevitabley, left for Nirvana. |
|
|
| Andypairo |
| quote: | Originally posted by marco70
Hi, still in time for a transformer ? my Pedja's DAC boards (DAC+reclock) are still waiting for in their box....so sad :-(
Thanks
Marco |
The second group buy is not started yet so.. you are in time.
| quote: | Originally posted by ctleake
I hate to dampen anyone's enthusiasm, but Lupulroz of Rockna has not replied to me - maybe he has to Andypairo - and Buddha, who was coordinating the group buy has, I guess somewhat inevitabley, left for Nirvana. |
I didn't receive a answer either, however I also made other requests and I'm waiting for replies.:xfingers:
Cheers
Andrea |
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| Andypairo |
Just to be sure I also sent a request to Antrim (that made the first run also) with the "new" specs discussed with J.P.
Cheers
Andrea |
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| marco70 |
[QUOTE]Originally posted by Andypairo
[B]
The second group buy is not started yet so.. you are in time.
I didn't receive a answer either, however I also made other requests and I'm waiting for replies.:xfingers:
Ok, wait for good news then...Many Thanks
Marco |
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| Andypairo |
Just wanted to make clear that any suggestion about recommended manufacturer is welcome, better if located in the EU for limiting shipping costs.
Cheers
Andrea |
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| marco70 |
| quote: | Originally posted by Andypairo
Just wanted to make clear that any suggestion about recommended manufacturer is welcome, better if located in the EU for limiting shipping costs.
Cheers
Andrea |
Near Milano (Sesto S. Giovanni) Euroelektric Consult (Tecnotrafo) makes good transformers; two years ago I got some audio isolation trannies, the quality was adequate (they had to be rather cheaps). Just don't ask them toriodal, they did prefer EI winding. No ideas about the current prices.....
Note: the seems not to appear on the net, just reach them by phone: +39022409937
Hope it helps
Marco |
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| Andypairo |
Hello,
this is the reply I got from Antrim, by now the only with reasonable price (30£). I got another one but was much more expensive (>80€/pc)
---------------------------------------------------------------------------------
Hello Andrea,
Thank you for your enquiry. I wanted to just make you aware that the 10-24 price for a 120VA trasformers will be around £30.00 as you will have a large number of secondary windings. If you you are happy with this price please let me know and I will organise a custom design for you,
All the best,
Tracey Carney
Antrim Transformer Ltd
tracey@antimtransformers.com
Antrim:028 9442 8734
Mobile: 00353 87 9611311
-----Original Message-----
From: Antrim Staff
Sent: 12/12/2005 3:27 PM
To: Administrator
Subject: Request Quote
Name Andrea Pirovano
Country/state ITALY
Phone Number 3338611738
e-mail andrea.pirovano@libero.it
Your Reference PedjaDac
Power Rating VA 120
Primary Voltage V (100-600V) 115+115
Secondary Voltages (600V Max) Please Include Current Ratings 1- 8V 1A
2- 8V 1A
3- 8V 1A
4- 8V 1A
5- 21V 1A
6- 17V 1A
7- 17V 1A
8- 8V 1A
9- 80V 50mA
10- 80V 50mA
11- 6.3V 1A
Lead Lengths (standard 200mm) standard
Connectors just wires
Electrostatic Screen
Mounting Methods Encapsulated
Additional Requirements output wires at indicated positions (to follow)
Quantity 10 - 24
------------------------------------------------------------------------------------
Cheers
Andrea |
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| ctleake |
| How flexible a transformer that would be - for only 30 GBP - that's marvellous. Well I'd certainly commit to that. |
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| marco70 |
The price can't be better, IMHO... Count me for 1 piece, thanks
Marco |
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| Andypairo |
Let's wait a few days for the other manufacturer's eventual replies. After that we can officially re-start this group purchase.
Cheers
Andrea |
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| Andypairo |
I got another quotation from a Italian manufacturer, that was suggested to me in a Italian forum for being competent in audio transformers.
The brand is "Tector" (http://www.tector.it/) and the first price is a very good 40€ /pc (or thereabout).
I also got some other quotations but almost all were nearly 80€.
Searching for comments about this manufacturer I found only good ones:D
Being located in Italy would reduce further shipping costs to me, and therefore would make the whole GB more convenient.
What do you think about it?
Cheers
Andrea |
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| jean-paul |
Things look OK. Maybe the HT winding can be a single 80V 100 mA and the optional 8V for the reclocker can be omitted ( with a low drop regulator the 6.3 V winding can be used for that ) ?
But right now price is already good for a quality transformer. I am just curious how it will look with 26 wires coming out of it ;) |
|
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| Andypairo |
Hello JP I used a dual 80V secondary to give more flexibility (series or parallel or independent connections) and thus the possibility to use a different type of tube or topology (SRPP, etc).
The reclocker IMHO is a must. I built a couple of DACs and must say that it really improves things.
Probably you can better it using a good clock and bringing it back to the transport (as done in Linn Karik-Numerik combo) but this means heavily modifying the transport.
So I would leave it like that.
Cheers
Andrea
PS Did anybody give a call at their out-of-the-door manufacturer? |
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| ctleake |
I don't think it was being suggested that the reclocker be dropped (heaven forfend !) but that the 6.3 secondary could be employed.
However, that would mean abandoning anybody's plans for a valve stage. Personally, I'd be prepared to power my planned valve stage with an extra transformer (which I happen to have).
Perhaps we should just keep to the reduced spec version of Pedja's original, if money is tight for the chaps out there.
20 euros is of course an excellent price Andypairo: thank you for your heroic services in the cause of HiFi !!! |
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| nullspace |
Me personally, I'd prefer the original version with the reduced specs. If I decide to add a tube stage at a later date, I'd prefer to just pick up an appopriate transformer rather than be limited by the one I already have.
Regards,
John |
|
|
| Andypairo |
Hello,
I know JP wasn't suggesting to drop the reclocker but since more than one member (including myself) is willing to use both Thorsten's output stage and the reclocker I don't think it's wise to drop a secondary. After all I won't be using the 2*17V secondaries but I didn't propose to wipe them out :D
If one doesn't need a winding he can just leave it open, resulting in a oversized core.
BTW Ctleake where did you read 20€?
If everybody agrees we can count how many of us are willing to buy such a trafo...
Please post on the thread quoting the previous participants
Andypairo 1
xxxx 2 <- put your name here
Cheers
Andrea |
|
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| ctleake |
Sorry Andrea, I must have converted to pounds then converted again - must get more sleep !
40 euros (~27 pouinds) will still count me in
Andypairo 1
Ctleake 2 (i.e. group buyer number 2 who would like to buy 1 transformer)
Cheers
Chris |
|
|
| nullspace |
Andypairo 1
Ctleake 2
nullspace 3
Regards,
John |
|
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| marco70 |
Andypairo 1
Ctleake 2
nullspace 3
marco70 1
thanks
Marco |
|
|
| dhaen |
Andypairo 1
Ctleake 2
nullspace 3
marco70 1
dhaen 1
Thanks |
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| ctleake |
Okay, I'm confused. When Andrea produced his template:
Andypairo 1
xxxx 2 <- put your name here
I assumed that the 2 was person 2 not 2 transformers. But the latest list:
Andypairo 1
Ctleake 2
nullspace 3
marco70 1
gives me pause for thought. Does the numeral represent the position of the person in the list, or the number of transformers the person wants ????
If the latter, I should like to amend the list to:
Andypairo 1
Ctleake 1
nullspace 3
marco70 1
But does that leave nullspace on a promise to buy three transformers contrary to his intention?
Andrea, what did you intend? |
|
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| Cobra2 |
I want 2, fill me in where it fits...
Arne K |
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| nullspace |
I followed ctleake's lead; I was third in line, but I only need one transformer. By my count, we are up to six trannies in total:
Andypairo 1
Ctleake 1
nullspace 1
marco70 1
Cobra2 2
Regards,
John |
|
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| ctleake |
Incorporating dhaen's request:
Andypairo 1
Ctleake 1
nullspace 1
marco70 1
Cobra2 2
dhaen 1 |
|
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| Andypairo |
Hello,
I contacted Tector again and they gave am a approx. delivery time of about a month (because of Christmas holidays).
If we get enough orders (3 at least) we can proceed before the end of the year.
Those who are interested please confirm.
Thanks
Andrea |
|
|
| nullspace |
Hi Andrea --
Any chance you could give me a round number for shipping to the US? Riverton, NJ 08077. Thanks.
Regards,
John |
|
|
| Andypairo |
| quote: | Originally posted by nullspace
Hi Andrea --
Any chance you could give me a round number for shipping to the US? Riverton, NJ 08077. Thanks.
Regards,
John |
Hello John,
looking at the specs of the "original" trafo this one should weigh, once packed, about 2.5kg.
Shipping costs seem quite expensive (>50€ to USA), I will try to see if the courier we use at my workplace is cheaper.
Will let you know.
In the EU a package up to 3 kgs costs about 25€, up to 5 kg only 28,8€.
Cheers
Andrea |
|
|
| ctleake |
| quote: | | If we get enough orders (3 at least) we can proceed before the end of the year. |
Andrea, count on me as a definite. By the by, how much is posting to London, UK? |
|
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| dhaen |
ctleak,
Would you be prepared to share postage with me? I am in SE London every fortnight and could collect from or deliver to you. I also just want one. |
|
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| ctleake |
| Well John, if the cost of posting two is less than two times the cost of posting one, we should definitely do this. |
|
|
| Andypairo |
| quote: | Originally posted by ctleake
Andrea, count on me as a definite. By the by, how much is posting to London, UK? |
Well, if UK hasn't gone out of the EU in the last days postage costs have been posted
:D
Cheers
Andrea |
|
|
| ctleake |
Thanks for setting me straight Andrea. I guess as a typical Englishmen this EU business still seems a bit 'new-fangled' and 'not very English'. Are we 'in the EU', or is the EU looming threateningly over us? Is it friend or foe? They'll have to give my generation a few years to die out.
Anyway, I hope you and all the message-boarders had a cuddly little Christmas. |
|
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| nullspace |
Despite shipping being more than the cost of the transformer, I'm in for the GB.
Regards,
John |
|
|
| jean-paul |
| quote: | Originally posted by ctleake
Thanks for setting me straight Andrea. I guess as a typical Englishmen this EU business still seems a bit 'new-fangled' and 'not very English'. Are we 'in the EU', or is the EU looming threateningly over us? Is it friend or foe? They'll have to give my generation a few years to die out.
|
OT: Great Britain is the EU according to Blair but it has more discount every year than Holland has to pay in total. Besides that GB does not have the horror of the Euro. In short, GB has the advantages but nearly no disadvantages.
Nothing to be afraid of, really. That will change when you'll have the Euro ;)
On topic: Andrea, I maybe have another company that can make the transformers. Please wait till 6th of january. I will ask for 2 types, one including the 6.3 V and 80 V secundaries and one without them. |
|
|
| Andypairo |
| quote: | Originally posted by jean-paul
On topic: Andrea, I maybe have another company that can make the transformers. Please wait till 6th of january. I will ask for 2 types, one including the 6.3 V and 80 V secundaries and one without them. |
Ok I'll wait for news.
Cheers
Andrea |
|
|
| nullspace |
Any news on the latest GB?
Thanks,
John |
|
|
| jean-paul |
Yesterday I got a reply that they only make E-I or C-core transformers.
I asked for a pricequote. |
|
|
| nullspace |
Anybody have any idea on where we stand?
Thanks,
John |
|
|
| ctleake |
So to labour the point the Tector specification will be the following? (courtesy of Andrea)
Your Reference PedjaDac
Power Rating VA 120
Primary Voltage V (100-600V) 115+115
Secondary Voltages (600V Max) Please Include Current Ratings 1- 8V 1A
2- 8V 1A
3- 8V 1A
4- 8V 1A
5- 21V 1A
6- 17V 1A
7- 17V 1A
8- 8V 1A
9- 80V 50mA
10- 80V 50mA
11- 6.3V 1A |
|
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| Andypairo |
Hi all,
I don't think that excluding the HV and filament secondaries would make the transformer remarkably cheaper.
On the other hand those who don't need them will have a trafo with a oversized core working at lower flux.:D
I'd suggest to go with Tector's trafo... do you agree??
Maybe it't time to open a new thread....
Cheers
Andrea |
|
|
| Andypairo |
Maybe a little cleaning won't hurt ;)
In the meanwhile, since the number isn't exactly 10, I will ask if the price will be the same.
Cheers
Andrea |
|
|
| jean-paul |
Done, I cleaned it up a little.
This was the last score ( dhaen wsin if HV windings were included ) :
Andypairo 1
Ctleake 1
nullspace 1
marco70 1
Cobra2 2
dhaen 1 |
|
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| ctleake |
| Time for a role call to confirm? I'm in. |
|
|
| Andypairo |
Time to finalize things.
I plan to confirm the total number of trafos next monday.
So those who are interested please sign in!
Cheers
Andrea
PS For the fellow Italians (shipping costs are lower) I asked a quote for a 24+24V 250VA and got a 25€ figure. |
|
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| nullspace |
I would like to confirm that a) I'm in and b) that there will be no more levity from me.
Regards,
John |
|
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| iestynrw |
Please count me in for one.
cheers
iestyn |
|
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| ctleake |
Andrea,
So how do we arrange the money side? Paypal? Notes in the Post? Sterling or Euro?
Am I right in calculating 40+25 Euros for the UK? Do you need the 40 Euros by 30th January?
It's really good of you to shoulder this vital part of the project: you deserve the Pedja Peace Prize.
Yours appreciatively,
Chris |
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