They are all annodized and some were slightly out of colour. They must of been rejects seeing how they didn't get perfect matching colour.
As for a 1000VA dual split bobbin transformer. I don't do believe such one exists.
As for a 1000VA dual split bobbin transformer. I don't do believe such one exists.
Hello,
When I was serviceing the BELL stage amplifier, I saw the transformer ( dual split bobbin over 500 VA) that is installed in it.
It looked very unusual for that size.
Also, the Technics use them in their SU-C1000 preamplifier, but they are small.
I tried to find some dual split bobbin transformers, but I did not have any luck.
------
Does anyone tried to anodize heatsinks in clear blue (transparent) color ?
Is there any company in the Europe that sell them already colored, or provide service of blue color anodizing ?
What about DIY anodizing, is it possible for blue color, anyone tried it ?
Regards,
Kristijan Kljucaric
When I was serviceing the BELL stage amplifier, I saw the transformer ( dual split bobbin over 500 VA) that is installed in it.
It looked very unusual for that size.
Also, the Technics use them in their SU-C1000 preamplifier, but they are small.
I tried to find some dual split bobbin transformers, but I did not have any luck.
------
Does anyone tried to anodize heatsinks in clear blue (transparent) color ?
Is there any company in the Europe that sell them already colored, or provide service of blue color anodizing ?
What about DIY anodizing, is it possible for blue color, anyone tried it ?
Regards,
Kristijan Kljucaric
I am a little unsure if these guys have split bobin transformers (since I am a little unfamiliar with them) but I think they have what you need to about 500 VA (use 2 - on for each rail?):
http://www.selectronic.fr/
/UrSv
http://www.selectronic.fr/
/UrSv
Thank you UrSv,
I tried at http://www.selectronic.fr/ , but I still have no luck.
I can't find the transformers.
Maybe the reason is that the site is on French, and I don't understand much.
Do you know the direct link to the page with the transformers ?
Regards,
Kristijan Kljucaric
I tried at http://www.selectronic.fr/ , but I still have no luck.
I can't find the transformers.
Maybe the reason is that the site is on French, and I don't understand much.
Do you know the direct link to the page with the transformers ?
Regards,
Kristijan Kljucaric
Anodizing
This is the best info on anodizing that I have seen. It seems pretty comprehensive, and the author indicates that colored stuff is very possible. I haven't tried it yet.
http://www.focuser.com/atm/anodize/anodize.html
This is the best info on anodizing that I have seen. It seems pretty comprehensive, and the author indicates that colored stuff is very possible. I haven't tried it yet.
http://www.focuser.com/atm/anodize/anodize.html
Thanks vpharris. Finally an anodizing procedure that uses stuff around the house. Very simple process. Thanks a lot.
Off topic to some extent but...
The Selectronic web site is strange code so I can not give direct links but it's almost like English (...) so go for Catalogue en ligne (Catalogue on-line), then click the little fella and choose Par Famille (by family) button at the top. Transformers and then type 'R'. Should get you there.
A picture would be this if it is what you are after:
/UrSv
The Selectronic web site is strange code so I can not give direct links but it's almost like English (...) so go for Catalogue en ligne (Catalogue on-line), then click the little fella and choose Par Famille (by family) button at the top. Transformers and then type 'R'. Should get you there.
A picture would be this if it is what you are after:
/UrSv
Attachments
Hi Kristijan,
you can find r-core transformers at
http://www.kitamura-kiden.co.jp/english/products_e.html
In Germany you can get them at www.hifituning.de
Peter
you can find r-core transformers at
http://www.kitamura-kiden.co.jp/english/products_e.html
In Germany you can get them at www.hifituning.de
Peter
Hello,
Thank you guys.
You helped me a lot.
Did someone find the 1000 VA model ?
No matter of output voltage.
Regards,
Kristijan Kljucaric
Thank you guys.
You helped me a lot.
Did someone find the 1000 VA model ?
No matter of output voltage.
Regards,
Kristijan Kljucaric
hi,
Does anyone from experience know what size of heatsinks
should be used for cooling the mosfets in the Aleph p 1.7 preamplifier ?
Is it possible to use 56 Volt power supply for Aleph p 1.7 preamplifier ? (it is regulated)
Does anyone from experience know what size of heatsinks
should be used for cooling the mosfets in the Aleph p 1.7 preamplifier ?
Is it possible to use 56 Volt power supply for Aleph p 1.7 preamplifier ? (it is regulated)
Hello,
Try to use 10 - 15 C/W per device, and everything should be fine.
Also, the bigger heatsinks will not hurt either.
On the other way, it is even possible to not use the heatsinks.
That way you can mount the devices on the bottom side of the PCB, and then all together on the chasis - that will also serve as a heatsink.
But with this way you must be prepared for increased
temperature of the enclosure.
I tried this, it's working very well, but you be shure not to use the Letters C with this way.
With 56 V power supply, the Aleph 1.7 will work ok, but if you can, try to use 60 V, like Mr.Pass originaly used.
I would use 56 V only as a last option.
You can use 1/2 power supply of the BLS preamplifier, just increase the rating of the transformer to 100 VA or so, per one channel.
Little increasements of power supply capacitors is also desireable.
Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
Try to use 10 - 15 C/W per device, and everything should be fine.
Also, the bigger heatsinks will not hurt either.
On the other way, it is even possible to not use the heatsinks.
That way you can mount the devices on the bottom side of the PCB, and then all together on the chasis - that will also serve as a heatsink.
But with this way you must be prepared for increased
temperature of the enclosure.
I tried this, it's working very well, but you be shure not to use the Letters C with this way.
With 56 V power supply, the Aleph 1.7 will work ok, but if you can, try to use 60 V, like Mr.Pass originaly used.
I would use 56 V only as a last option.
You can use 1/2 power supply of the BLS preamplifier, just increase the rating of the transformer to 100 VA or so, per one channel.
Little increasements of power supply capacitors is also desireable.
Best regards,
Kristijan Kljucaric
http://web.vip.hr/pcb-design.vip
R-Core vs Toroidal transformer
Which one's better for audio?
AND
Which one's cheaper? 🙂)
Regards,
Which one's better for audio?
AND
Which one's cheaper? 🙂)
Regards,
Psu of Aleph 1.7 with chokes
Fellow Aleph P 1.7 builders,
I would like to built my Alpeh with a seperate enclosure for the PSU. I have had excellent result from using chokes in several PSU that i built.
Now to decide what choke I can use, I need to know how much current the Aleph 1.7 draws (per channel) from the PSU. Does somebody know this? I looked here, but couldn't find the answer... Also, will the inruch current be very high?
Also, where should I place the chokes? Between the 1000 uF caps right after the rectifiers and before the voltage regulation? If I would put them after the voltage regulation, the 60V would drop a few volts, is this a problem?
Thanks for anwers!
Lucas
Fellow Aleph P 1.7 builders,
I would like to built my Alpeh with a seperate enclosure for the PSU. I have had excellent result from using chokes in several PSU that i built.
Now to decide what choke I can use, I need to know how much current the Aleph 1.7 draws (per channel) from the PSU. Does somebody know this? I looked here, but couldn't find the answer... Also, will the inruch current be very high?
Also, where should I place the chokes? Between the 1000 uF caps right after the rectifiers and before the voltage regulation? If I would put them after the voltage regulation, the 60V would drop a few volts, is this a problem?
Thanks for anwers!
Lucas
Re: Psu of Aleph 1.7 with chokes
Assuming you haven't seen the circuit it draws about 40mA per channel.
Conventinal thinking would suggest that a choke following the regulator will substantially negate regulation.
You can certainly try an unregulated, choke filtered supply
Fwiw i think the P1.0 sounds better anyway.
Lucas_G said:
Assuming you haven't seen the circuit it draws about 40mA per channel.
Conventinal thinking would suggest that a choke following the regulator will substantially negate regulation.
You can certainly try an unregulated, choke filtered supply
Fwiw i think the P1.0 sounds better anyway.
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