Cyrus 1 amp

lrseries3 · 7th October 2009, 05:58 AM

Hi, anyone know how to determine the polarity of old Elna caps? They are orange electrolitics but have no indication of the negative side.

Thanks Stuart

Iain McNeill · 7th October 2009, 06:22 AM

Look at the shape of the leads bonding onto the cap. Are they different?

If the cap is perfectly symmetrical in every way then it might be bipolar.

lrseries3 · 7th October 2009, 07:23 AM

Yes, as new they electrolitics have a short and long leg, but once they go into a circuit they are trimmed you have no idea using this method which is which. I doubt they are bipolar, their physical appearance shouts electrolitic.
Stuart

lrseries3 · 7th October 2009, 09:05 AM

Mmmm, but they're not electrolitics it seems after consulting the schematic! What are they and how does one specify them in order to replace?

richie00boy · 7th October 2009, 09:38 AM

I thought they were marked, but it's been a few years now since. You can work it out from the schematic, it's available on here and elsewhere online if you do a quick search

lohk · 7th October 2009, 10:37 AM

All those small orange Elna elcaps on the Cyrus 1 board are in fact bipolar (ELNA CE-BP).

lrseries3 · 7th October 2009, 10:15 PM

Thanks lohk, found a source to purchase replacements.

Stuart

lrseries3 · 12th October 2009, 01:25 AM

Hi,
Anyone know what the big brown ones are that are hiding under the strap in the middle or the board are? The markings are 47016 (470R ??), x1 EKU, ROE (ROEDERSTEIN?).

Thanks
Stuart

daccordimark · 12th October 2009, 01:17 PM

Hi,
They are indeed Roederstein 470uF/6V bi-polar electrolytics. I'm still looking for suitable replacements for my own Cyrus 1 amp. I've replaced a bunch of the caps already with Black Gates (I now realise these probably aren't the best type to use in an amp) but I'm struggling to find anything to replace the Roedersteins.
Regards,
Mark.

lrseries3 · 13th October 2009, 09:31 AM

Hi Mark,

I have contacted Farnells NZ to see what they can come up with.

Stuart

7th October 2009, 05:58 AM	#1
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Cyrus 1 amp Hi, anyone know how to determine the polarity of old Elna caps? They are orange electrolitics but have no indication of the negative side. Thanks Stuart

7th October 2009, 09:38 AM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I thought they were marked, but it's been a few years now since. You can work it out from the schematic, it's available on here and elsewhere online if you do a quick search __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

7th October 2009, 10:37 AM	#6
lohk diyAudio Member Join Date: Apr 2001 Location: Austria, near Linz	All those small orange Elna elcaps on the Cyrus 1 board are in fact bipolar (ELNA CE-BP). __________________ /alohka/

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7th October 2009, 06:22 AM	#2
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	Look at the shape of the leads bonding onto the cap. Are they different? If the cap is perfectly symmetrical in every way then it might be bipolar.

7th October 2009, 07:23 AM	#3
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Yes, as new they electrolitics have a short and long leg, but once they go into a circuit they are trimmed you have no idea using this method which is which. I doubt they are bipolar, their physical appearance shouts electrolitic. Stuart

7th October 2009, 09:05 AM	#4
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Mmmm, but they're not electrolitics it seems after consulting the schematic! What are they and how does one specify them in order to replace?

7th October 2009, 10:15 PM	#7
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Thanks lohk, found a source to purchase replacements. Stuart

12th October 2009, 01:25 AM	#8
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Hi, Anyone know what the big brown ones are that are hiding under the strap in the middle or the board are? The markings are 47016 (470R ??), x1 EKU, ROE (ROEDERSTEIN?). Thanks Stuart

12th October 2009, 01:17 PM	#9
daccordimark diyAudio Member Join Date: Dec 2008 Location: West Yorkshire, England	Hi, They are indeed Roederstein 470uF/6V bi-polar electrolytics. I'm still looking for suitable replacements for my own Cyrus 1 amp. I've replaced a bunch of the caps already with Black Gates (I now realise these probably aren't the best type to use in an amp) but I'm struggling to find anything to replace the Roedersteins. Regards, Mark.

13th October 2009, 09:31 AM	#10
lrseries3 diyAudio Member Join Date: Sep 2009 Location: New Zealand Blog Entries: 1	Hi Mark, I have contacted Farnells NZ to see what they can come up with. Stuart

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