I posted this over on the amp section but should have been here.
I am recapping my Adcom GFP-565 and was wondering what the forum members might recommend. My choices so far are:
Elna Silmic II
Panasonic FM
Nichicon Muse
The old capacitors are Panasonic.
I believe I have decided on the Panasonic FM. When measuring across the soldered leads of the caps in the preamp I find 7mm between the - and +. Should I go with a tapped lead of 5mm or stick to the 2.0mm leads?
I know this sounds trivial to some but this is my 1st project and with all the specifics dealing with components I want to make sure I get it right the 1st time especially when ordering.
I am recapping my Adcom GFP-565 and was wondering what the forum members might recommend. My choices so far are:
Elna Silmic II
Panasonic FM
Nichicon Muse
The old capacitors are Panasonic.
I believe I have decided on the Panasonic FM. When measuring across the soldered leads of the caps in the preamp I find 7mm between the - and +. Should I go with a tapped lead of 5mm or stick to the 2.0mm leads?
I know this sounds trivial to some but this is my 1st project and with all the specifics dealing with components I want to make sure I get it right the 1st time especially when ordering.
If the holes in the solder pads are ~7.6mm centre to centre, then the actual spacing is almost certainly 0.3"
Buy capacitors that have 0.3" pin pitch. These will fit straight into the existing holes.
Buy capacitors that have 0.3" pin pitch. These will fit straight into the existing holes.
Thank you sir for your response. The caps that I am looking at and that will fit next to each other in this unit are the Panasonic FM capacitors. Their data sheet does not reference 0.3" pitch but that translates to roughly 7.5mm. Here is the data from their sheet:
"When requesting taped product, please put the letter "B" or "H" between the "( )". Lead wire pitch B=5 mm, 7.5 mm, H=2.5 mm."
So Andrew I will add the "B" into the part number of any capacitor I am ordering for this unit that is Panasonic FM series. That would give me a 5mm or a 7.5mm pin pitch. I am curious to see how you get both pitches. I am hoping to have the caps flat on the board.
Thank you again for your time and your help.
Kevin
I think that (B) would get you 5mm LS and () would get you 7.5mm and (H) would get 2.5mm. Maybe () is not available for the taped ("ammo belt") versions.
But most places you could order from will have one or more specific lead spacings available, so you should be able to know what you're getting before you order.
But most places you could order from will have one or more specific lead spacings available, so you should be able to know what you're getting before you order.
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I think that I will end up calling the distributor and just speaking with them on the lead spacings. With me never using these capacitors that would be the only way to roll I think. Otherwise I may get stuck with a bunch of caps that I just cannot use. Thank you for responding.
Try Digikey.com for Panasonic caps.
Their 'search engin' allows to filter for series, lead spacing, voltage, etc.
I would go with the Panasonic FC series.
Digikey carries stock of a nice variety of physical sizes and voltages in this series, the FM series is somewhat limited re. sizes and voltages.
E.g.:
Digi-Key - P10310-ND (Manufacturer - EEU-FC1V222S)
...$67 for 50 caps.
Measure the actual DC voltage across the current caps and make sure the new caps are rated 25 to 50% more than this.
Their 'search engin' allows to filter for series, lead spacing, voltage, etc.
I would go with the Panasonic FC series.
Digikey carries stock of a nice variety of physical sizes and voltages in this series, the FM series is somewhat limited re. sizes and voltages.
E.g.:
Digi-Key - P10310-ND (Manufacturer - EEU-FC1V222S)
...$67 for 50 caps.
Measure the actual DC voltage across the current caps and make sure the new caps are rated 25 to 50% more than this.
Normally you should be OK with just replacing the current caps with units of the same voltage.
But it seems the current caps failed prematurely, so better to be sure you replace with units of sufficient rating. Also to verify that the voltage is within reason for operation of the rest of the amp.
Careful not to create any shorts with the meter probes - that capacitor bank contains significant energy and will do a nice bang.
Caps vary in quality. Some last for many decades, some for a couple years at best. The original designer may have been "encouraged" to use parts the company already used in other designs so they could stock fewer parts and save money. The size and voltage may not have been as carefully thought out as one might hope. By measuring the voltage and applying a safety factor, you can be sure of having a suitable rating. BTW, avoid caps rated for under 16VDC as they just don't seem to last. Physically larger is usually better than smaller. Stick with brand names that have a good history. Nichicon, Rubycon, Panasonic, Illinois, Sprague (do they still make 'em?).
Thank you Conrad. I will stick to those brands and be careful of using any capacitors that are rated under 16VDC.
Good advice. I have electrical and large telecommunications systems experience but not down to the component level. The safety thread that is here on this site is something everyone should read, even the pros. I am armed with a 200k ohm 2 watt resistor to discharge the caps. Purchased some leads with gator clips on them so that I can leave the resistor inline with the big PS caps as I work. Got all that info from the site and it makes me feel better about working around them.
I have another question before I place this order for my capacitors. Some of the caps I need just cannot be found in Elna or Nichicon in 7.5mm pitch which is what I need. Cannot find it in Panasonic FM or FC with a 7.5mm lead spacing either. Will a 5mm pitch work ok?
With 5mm LS you will have to form the leads and the capacitors will not sit flush and secure with the board.
Increase the capacity or voltage until you get to 7.5mm LS.
Make sure not to exceed the available board space (diameter) or vertical clearance (height). 7.5mm LS caps are typically 16 or 18 mm in diameter and can be up to 40mm high.
E.g. FMs at Digikey:
and FC:
(This is only half of 4 pages of 7.5mm FC caps!)
Increase the capacity or voltage until you get to 7.5mm LS.
Make sure not to exceed the available board space (diameter) or vertical clearance (height). 7.5mm LS caps are typically 16 or 18 mm in diameter and can be up to 40mm high.
E.g. FMs at Digikey:
and FC:
(This is only half of 4 pages of 7.5mm FC caps!)
All good advice and thank you for it. One other question (again)!
I have to buy some 6800uf caps 50v but I am having a problem finding only snap-in types. Is this a problem when it comes to mounting them? The lead spacing is 10mm which is good but the pins look to be offset from one another.on all of these snap-ins.
I have to buy some 6800uf caps 50v but I am having a problem finding only snap-in types. Is this a problem when it comes to mounting them? The lead spacing is 10mm which is good but the pins look to be offset from one another.on all of these snap-ins.
Snap-ins require larger diameter holes in the board than regular leaded capacitors, otherwise they are similar.
The leads are little formed plates that grips the board, hence the 'snap-in' nomenclature.
The one I have in front of me require 2mm dia holes, but check the data sheet.
Make sure if you need 2, 3, or 4 pin capacitors.
If it is a single sided board, worst case you can drill the holes bigger if needed.
If it is a double sided board the holes will be plated or riveted and you are better to remove an old capacitor, clean up the hole and measure it.
Regular leaded 6800 uF 50V capacitors do exist btw:
Digi-Key - 493-1117-ND (Manufacturer - UVR1H682MRD)
The leads are little formed plates that grips the board, hence the 'snap-in' nomenclature.
The one I have in front of me require 2mm dia holes, but check the data sheet.
Make sure if you need 2, 3, or 4 pin capacitors.
If it is a single sided board, worst case you can drill the holes bigger if needed.
If it is a double sided board the holes will be plated or riveted and you are better to remove an old capacitor, clean up the hole and measure it.
Regular leaded 6800 uF 50V capacitors do exist btw:
Digi-Key - 493-1117-ND (Manufacturer - UVR1H682MRD)
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I will probably get two of those for the power supply section of my preamp. I cannot find any hole diameter specs for my preamp board but those do seem much bigger looking at the underside of the board at the solder pads. They have seem to have decent specs:
http://nichicon-us.com/english/products/pdfs/e-vr.pdf
Thank you for the replies.
http://nichicon-us.com/english/products/pdfs/e-vr.pdf
Thank you for the replies.
You would be better off to only use snap-in types if the originals were snap-ins.
Mouser.com has lots of types of Nichicon that are 6800uF and >=50V that are radial-leaded and not snap-in type. They have both 10mm and 12.5mm lead spacing, and maybe others. They are apparently all 50mm tall and have either 22mm or 25mm diameter.
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