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26th Aug 2021, 8:50 pm | #1 |
Diode
Join Date: Aug 2021
Location: Macclesfield Cheshire
Posts: 3
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1970s Centralab Ceramic Caps
Hello
I’m trying to find 6 x Centralab 0.47uf 10v ceramic caps in order to restore a vintage effect pedal. I’ve searched every site worldwide I can find with no luck and could obviously use modern versions, but the pedal is very valuable and it would devalue it considerably to do so. So I wondered if anybody out there could help me with a source for these or at least a set of something from the period very similar? Last edited by Cobaltblue; 26th Aug 2021 at 9:37 pm. Reason: Please put image in post not link |
26th Aug 2021, 9:40 pm | #2 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,874
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Re: 1970s Centralab Ceramic Caps
Hi and welcome to the forum.
We dont like new users posting external links due to the risk of spam. Please attach a picture to a post Cheers Mike T
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26th Aug 2021, 10:30 pm | #3 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: 1970s Centralab Ceramic Caps
Are you sure they're ceramic? If they really are, they probably don't need replacing.
If you could post a picture to verify, that would be very helpful. if they happen to be electroytic, which is more likely for a 470n 10V capacitor, you could try restuffing the old ones. |
26th Aug 2021, 11:14 pm | #4 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,397
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Re: 1970s Centralab Ceramic Caps
There were some fairly awful low-voltage ceramic caps around in the past, they are one of the bugbears of Marconi test gear of the era- I was surprised to find this out but when I did, I checked the bag of several dozen NOS 100nF 30V ceramic discs that I had, every one was badly leaky on a low-voltage ohm-meter. I once found 6V rated disc ceramics in a French portable record player!
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27th Aug 2021, 12:05 am | #5 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
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Re: 1970s Centralab Ceramic Caps
I will nearly bet they are those HORRIBLE dried out .47uF 10volt electrolytics that were so popular 30 or 40 years ago. Most japanese stuff had at least 20 of them in their circuitry. Especially bothersome in phono stages where they were used for coupling and feedback.
Joe |
27th Aug 2021, 8:04 am | #6 |
Moderator
Join Date: Dec 2010
Location: Exeter, Devon and Poole, Dorset UK.
Posts: 6,874
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Re: 1970s Centralab Ceramic Caps
Unfortunately I had to remove the link but the caps on the link were as described not electrolytic but small round (green) ceramic caps. If you google the description you will find pictures.
Cheers Mike T
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Invisible airwaves crackle with life or at least they used to Mike T BVWS member. www.cossor.co.uk |
27th Aug 2021, 9:11 am | #7 | |
Dekatron
Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 7,577
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Re: 1970s Centralab Ceramic Caps
Quote:
Even if original types could be found, they will be old stock and as leaky as the originals fitted so it would seem to be a pointless exercise.
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27th Aug 2021, 1:54 pm | #8 |
Diode
Join Date: Aug 2021
Location: Macclesfield Cheshire
Posts: 3
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Re: 1970s Centralab Ceramic Caps
Thanks All
Sorry for the link mistake, I've now attached a photo to make amends (or t least I think I have!). This is an image of the correct caps for my specific pedal, it was a short run version and was nicknamed "The 47" as most of the caps and resistors were some variation on a 47 value. I know they are not great caps and these old pedals vary so much in sound from one to another that no two ever sound the same. The issue I've got with mine is someone has messed with the original early 70s board and replaced with modern film caps of the wrong value. Great for tolerance and stability, but bad for an OCD collector like me who wants an authentic version, not to mention heavily devaluing it. I'd really like to take it back to how it was when it came out of the factory with the bad period ceramics if possible. |
27th Aug 2021, 2:37 pm | #9 |
Octode
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 1,737
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Re: 1970s Centralab Ceramic Caps
These are about the closest I can see for sale; https://www.ebay.co.uk/itm/143234846286
They are marked .47M and M is a tolerance of 20%, the existing ones marked Z are worse at +80%/-20% tolerance. I found them searching for 470nF (same as 0.47uF) 10V disc capacitor. I'm guessing low voltage disc caps are a thing of the past and new stuff uses MLCC surface mount stuff for low voltage. David |
27th Aug 2021, 3:48 pm | #10 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,554
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Re: 1970s Centralab Ceramic Caps
I would make them up.
Find some plastic disks slightly smaller that the capacitors and cut a notch in the side of the disk slightly wider than the lead spacing you want. Solder two wires to an SMD cap selected so that the target lead spacing is achieved. Wedge the cap with leads into the notch in the disk with a tiny spot of hot melt glue. Finally dip it in some green emulsion paint and allow to dry. |
27th Aug 2021, 6:46 pm | #11 |
Diode
Join Date: Aug 2021
Location: Macclesfield Cheshire
Posts: 3
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Re: 1970s Centralab Ceramic Caps
Thanks Factory, I found those on eBay too, but the seller only has 2 available unfortunately. I may just buy them anyway to stick in the parts box.
That is great idea Refugee, vintage look with modern tolerances…….now what can I fuse as discs! |
28th Aug 2021, 1:21 pm | #12 |
Octode
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 1,737
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Re: 1970s Centralab Ceramic Caps
Having another look for modern parts, it appears 0.47uF through-hole ceramic capacitors are still made, but only in 25V or higher ratings, some examples from Farnell;
https://uk.farnell.com/w/c/passive-c...=25v|25vdc|50v David |
6th Sep 2021, 8:04 pm | #13 |
Hexode
Join Date: Aug 2014
Location: Featherstone, West Yorkshire, UK.
Posts: 386
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Re: 1970s Centralab Ceramic Caps
Have a try on
https://www.facebook.com/groups/synthrepair/ One of the members may have a box of them. |