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Old 14th May 2015, 08:30 PM   #1
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Default Luxman L-510 capacitors?

Hello,

New to the forum but not to Hi-fi.

I opened up my eyes a few month ago for Vintage Hi-fi and found myself a completely new World of really good amplifiers etc.

I bought myself a Luxman L-510 in really good shape a couple of days ago and It drives my Dynaudio X16 excellent.

I have looked inside the amp and It looks also really good and I can not see any particular leakage etc on the mainboard. Maybe it has been refurbished years ago.

I wondering where to find new caps to these amps? Recommended caps to use on these amps? This is just for future precaution as I will keep this amp for a long time. A Dream has come true to find a example as good as this.

Link to webshop for example :-)

Any other things to look at or have as spare part?

So right now the amp works great but Im interested to have spare at home in case of.

Br
Johan

Last edited by ljungberg; 14th May 2015 at 08:57 PM.
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Old 15th May 2015, 08:21 AM   #2
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The main PSU filter caps in this model always fail. They must be replaced. These are the big 15,000 F (15 mF) 63 volt caps on the side, near the transformer. You can put anything here ranging from 10,000 to 33,000 F, as long as the voltage rating is at least 63V.

Small signal transistors in the power amp (2SA992/2SC1845) also commonly fail, causing a distorted output signal.

Do not buy capacitors from small stores as you're practically guaranteed to get old, dried up parts. Always buy from huge sources such as Digikey, Mouser, TME, etc...
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Old 15th May 2015, 09:10 AM   #3
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Quote:
Originally Posted by Welcome View Post
The main PSU filter caps in this model always fail. They must be replaced. These are the big 15,000 F (15 mF) 63 volt caps on the side, near the transformer. You can put anything here ranging from 10,000 to 33,000 F, as long as the voltage rating is at least 63V.

Small signal transistors in the power amp (2SA992/2SC1845) also commonly fail, causing a distorted output signal.

Do not buy capacitors from small stores as you're practically guaranteed to get old, dried up parts. Always buy from huge sources such as Digikey, Mouser, TME, etc...
Thanks,

Much appreciated. I will check with the suppliers You mentioned.

Br
Johan
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Old 15th May 2015, 09:37 AM   #4
h_a is offline h_a  Europe
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Quote:
I can not see any particular leakage etc on the mainboard.
I refurbished a lot of vintage gear and never ever saw leakage so far despite that the caps showed weird behaviour partly.

I start to think leakage is a bit of a myth - for properly rated caps.

I would replace them with same size modern parts. As modern parts are a lot smaller than the old ones, I would use higher voltage caps but keep the same capacitance preferably. Of course small increases in capacitance won't hurt.
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Old 16th May 2015, 01:52 PM   #5
hahfran is offline hahfran  Germany
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In my experience it is operating temperature close to the upper specified operating range which deteriorates electrolytic caps. Rather old computer grade caps ( Sprague etc. ) which are rather bulky devices appear to be almost immune to high temps, while most modern - and relatively small - kinds are more sensitive. The effect is that the series resistance rises, the parallel resistance -leak - drops, and capacity drops, too. Professional power supplies for old mainframe computers had the caps as far as possible away from transformers and heatsinks as the reliability was specified.
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Old 18th May 2015, 01:23 PM   #6
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Quote:
Originally Posted by Welcome View Post
The main PSU filter caps in this model always fail. They must be replaced. These are the big 15,000 F (15 mF) 63 volt caps on the side, near the transformer. You can put anything here ranging from 10,000 to 33,000 F, as long as the voltage rating is at least 63V.

Small signal transistors in the power amp (2SA992/2SC1845) also commonly fail, causing a distorted output signal.

Do not buy capacitors from small stores as you're practically guaranteed to get old, dried up parts. Always buy from huge sources such as Digikey, Mouser, TME, etc...
Do You know what type of material in the capacitor to use? For ex aluminium, ceramic tantalum, thin film etc.

I found Digi-keys homepage but they got a lot to choose from :-)

Br
Johan
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Old 18th May 2015, 01:47 PM   #7
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Hi,

These are Pictures from inside of the Luxman amp.

Is these original caps?
Attached Images
File Type: jpg DSC_2388.jpg (614.5 KB, 58 views)
File Type: jpg DSC_2387.jpg (727.3 KB, 55 views)
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Old 18th May 2015, 03:01 PM   #8
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Yes they are original. The type is aluminum electrolytic. Open the bottom cover and see what they have released for you. ;-)
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Old 1st June 2015, 11:50 AM   #9
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Quote:
Originally Posted by Welcome View Post
The main PSU filter caps in this model always fail. They must be replaced. These are the big 15,000 F (15 mF) 63 volt caps on the side, near the transformer. You can put anything here ranging from 10,000 to 33,000 F, as long as the voltage rating is at least 63V.

Small signal transistors in the power amp (2SA992/2SC1845) also commonly fail, causing a distorted output signal.

Do not buy capacitors from small stores as you're practically guaranteed to get old, dried up parts. Always buy from huge sources such as Digikey, Mouser, TME, etc...
Hi,

Can I use one of these?

NICHICON-73641

QTY ADD 22000uF / 63VDC, KG Series, Gold Tune, 50mmD x 100mmH, Solder Lug, Each

NICHICON-73619

QTY ADD 22000uF / 63VDC, KG Series, Super Through, 63mmD x 100mmH, Solder Lug, Each

NICHICON-73642

QTY ADD 22000uF / 80VDC, KG Series, Gold Tune, 63mmD x 100mmH, Solder Lug, Each

NICHICON-73620

QTY ADD 22000uF / 80VDC, KG Series, Super Through, 76mmD x 100mmH, Solder Lug, Each
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Old 1st June 2015, 03:29 PM   #10
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Only the first one would fit. I would also get something cheaper. These won't perform any better than 5-10€ caps.
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