Luxman Integrated Amplifier L550 ("L-550") Capacitor Replacement in the Power Supply - Page 2 - diyAudio
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Old 4th August 2011, 03:46 PM   #11
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This I have overlooked and perhaps the best choice:
EPCOS Sikorel 125 degrees 15mF/63V and 10m/100V
15000 64.3 80.7 6.0 15 11 40 31 11 B41554E8159Q000
10000 64.3 80.7 7.0 15 14 40 30 11 B41554E9109Q000
http://www.epcos.com/inf/20/30/db/aec_2011/B41554.pdf
http://pdf1.alldatasheet.com/datashe...E9109Q000.html
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Old 8th September 2011, 08:22 AM   #12
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Fischer & Tausche (ftcap) offered us a custom made version with 10mF/100V as remaining stock with similar datas for ESR than this EPCOS type:
10000 64.3 80.7 7.0 15 14 40 30 11 B41554E9109Q000
and in the size 65,3x80mm:
After removing the genuine ELNA caps with 33mF I perform a exact soundcheck with an old second L550 device in original condition. The result:
The caps from FT sounds much more better more details, much more exactly bass transmission) despite the fact, that capacity is only one third of the old value.
Thus the capacity value isn't critical, but the ESR: the lower the value, the better.
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Old 8th September 2011, 08:54 AM   #13
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Were your originals really 33,000? Not 30,000?

I think the improvement in sound you notice is simply a result of the caps being new.
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Old 8th September 2011, 09:54 AM   #14
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Quote:
Originally Posted by Coconuts 500 View Post
Were your originals really 33,000? Not 30,000?
I think the improvement in sound you notice is simply a result of the caps being new.
I think, 30.000uF (30mF) was the imprint.
Whether the improvement in sound alone due to the new condition has come, isn't clearly to say, because this ELNA devices are no longer available in new condition for investigate this exactly.
In general - there are 40 year old electrolytic capacitors in almost virgin state (e. g. the non exist German brand "FRAKO" but also certainly types of Siemens), even when used at high ambient temperatures.
Otoh - in most cases the caps are strongly aged (e. g. dried up), even if they were not used (i.e. through the store alone).
This experience I haven't make only by low costs versions, but also by BHC T-POWER - go to
http://www.schuro.de/Daten/BHC/ALN20S.pdf
for data sheet.
Therefore I can not recommend this type, special developed for audio amplifier power supplies (in general - I hate parts, especially electrolytic and foil caps, special made for audio).
Each version for typical industry applications with screw terminals is always the better choice.
Check in this case this thread:
Best electrolytic capacitors

Last edited by tiefbassuebertr; 8th September 2011 at 09:59 AM.
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Old 18th September 2011, 07:56 AM   #15
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Now I have a second device of this model (lLxman L550) for repair. There is an offset (33V) at the speaker output. I have find out, that the plugged front-End PCB isn't the reason, also not the output power BjT devices in the MT-100 outline.
The reason is the sub-PCB with follow parts:
- idle current adjustment with the associated parts for temperature compensation,
- driver transistors (TO-220 outline, first stage of discrete darlington output buffer mounted on small silver heatsink)

Now the question:
how I remove this PCB (way for disass'y with shortest amount of steps wanted) ??

Thank you for your advices.
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Old 27th September 2011, 08:29 AM   #16
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Default NJL5160D (NJL5160, NJL 5160 D, NJL 5160D) from Japan Radio Company (JRC) and misprint

With this device I have much more trouble than with that one mentioned under the earlier posts.
Follow problems I have:
1) there is an IC from JRC in use, that I don't know, which internal function there is present (perhaps an Optocoupler ? )
The only helpful proposals from Google is follow:
Luxman L-550 [?????] - ????? STALKER-Lab
currently similar type (no replacement) perhaps follow:
http://www.vishay.com/docs/83740/sfh617a.pdf
Who can post a data sheet ?

2) Obviously there are several mistprints in the schematic - go to
http://www.hifiengine.com/manuals/luxman/l-550.shtml

the pin numbers from the connections between the front-end PCB and the Vbe/protect PCB must be wrong, when I assume, that the individual number of one end go to the same number of the other (please note, that the first stage of the Super Beta Follower is located at the front end PCB).
Thus I work out follow connections:
A. VBE multiplier idle current:
PIN 23 front end PCB to 25 Vbe/protect PCB upper end
PIN 22 front end PCB to 23 Vbe/protect PCB lower end
B. Super Beta Follower - connection between first stage to second stage
PIN25 front end PCB to 24 second stage upper part
PIN24 front end PCB to 23 second stage lower part

What I might have overlooked ??

Last edited by tiefbassuebertr; 27th September 2011 at 08:40 AM.
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Old 16th April 2015, 09:03 AM   #17
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Gday, new here....I have jumped onto this forum as I am currently restoring a Luxman L550....wondering if this member is still active....and if anyone else here is familiar with this amplifier? technically
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Old 16th April 2015, 11:21 AM   #18
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HAving worked on various Luxman amps in this series I have a strong suspicion that the caps were deliberately marked with higher capacitances tgan were actually in use, and not by a small amount. This was the age of 'overcapping' and I would not be surprised at this but am surprised Luxman did it.
Two things to keep in mind:
1) these are class A amps, therefore heat is an issue, use 106C caps in the power supply - originals might have been specified for 85C but this is normal as 105C was extremely exotic then. The power supply rails are fairly low since these are 50WPC into 8 ohms. Why use 63 or 100V caps, this leaves you wuth a much lower capacitance. That being said, with high capacitance it comes down to the transformer and rectifiers. Noise and stray fields WILL affect sound.
2) Luxman of that era had a general problem with heat, u.e. rather hot running active components, on combination with basic FR2 phenolic base boards and trying to save on solder. Even if the amp works before a rebuild, RESOLDER EVERYTHING. Check all joints very carefully, as they might appear just fine, only to have a component literally fall out of a PCB at the slightest attempt of movement! YES I have had this literally happen, with TO126 and TO220 transistors soldered without heatsinks, large caps and resistors, including a bias transistor on a separate small board! This sort of thing may be the reason for the malfunction you have in your amp.
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Old 16th April 2015, 11:27 PM   #19
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Yes there are many reasons this amplifier is being rebuilt....but at the moment I am interested to know what the NJL5160D IC is doing on board PB 1400-2, There are two of these boards and i have had to replace both IC's due to capacitor glue eating the legs away....
Thing is I am not that confident in the part source and i can not find a data sheet on this part....

I not the OP has spoken of this, but thats where the thread trailed off...
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Old 17th June 2017, 07:12 PM   #20
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Quote:
Originally Posted by AlwaysTinkerin View Post
Yes there are many reasons this amplifier is being rebuilt....but at the moment I am interested to know what the NJL5160D IC is doing on board PB 1400-2, There are two of these boards and i have had to replace both IC's due to capacitor glue eating the legs away....
Thing is I am not that confident in the part source and i can not find a data sheet on this part....

I not the OP has spoken of this, but thats where the thread trailed off...
I have the same problem with both njl5160d ICs. Have you found any info on this part?
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