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Old 1st January 2017, 09:06 AM   #61
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by marcus1 View Post
Andrew, I'm not sure I understand where you would put the 0.6mm wire - do you mean using 0.6mm wire between the transformer's secondary AC output and the AC input of the amp board PCB?
the transformers flexible outputs are twisted to reach the rectifier.
The twisted triplet from the rectifier to the smoothing capacitors can be the same diameters.
After the smoothing capacitor, the AC and spike part is much reduced. The DC current is pretty low and I find that twisted triplet of 0.6mm diameter hook up wire is cold enough, for all the <100W amplifiers, even for two 100W channels running off the one PSU with ±40mF of smoothing.

A high spike current with the same Irms as a sinewave heats the wire (or resistor) more. The heat is proportional to IČR, a doubled current for 50% duty cycle has more heat than the undoubled current for 100% duty. yet supplies the same power.
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Old 4th January 2017, 12:58 PM   #62
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Is there any acknowledgement, to call it somehow, for the thread's original question: best capacitors for power supplies?

My friend's Luxman 5M20 needs a capacitor update, and the original ones no longer exist. They were United Chemicon 15000uF 63v screw terminals type.

Siemens/Epcos, which is a reliable brand, seems not to be in stock anywhere. There are newer good options, like BHC and Kendeil, but no feedback. Mundorf's screw types are too expensive.

Suggestions?
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Old 4th January 2017, 03:05 PM   #63
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Default 15000uF hard to find

Siemens and lots of others consider the 15000uF (and 6800uF etc...) to be an odd size not much in demand so MOQ is typically 72. That's why I was trying to get a group buy together for the Siemens 15mF but there was O interest.
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Old 11th January 2017, 11:03 AM   #64
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sorry if this is OOT, but does anyone know where i can get 1 uF wima mkp 2 ?

i'm gonna use them as decoupling caps in DAC chips because they have 5 mm lead spacing. btw this is a new value :

http://www.wima.com/EN/WIMA_MKP_2.pdf

i already ask mouser but no answers.
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Old 11th January 2017, 01:06 PM   #65
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http://www.mouser.com/Passive-Compon...m+mkp2&FS=True
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Old 11th January 2017, 11:57 PM   #66
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Quote:
Originally Posted by carlmart View Post
there's no 1 uF mkp 2 with 5 mm lead spacing. only mkp 4 and 10 with big lead space
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Old 12th January 2017, 01:31 AM   #67
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Yes, they do not stock MKP2 in 1uF.
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Old 12th January 2017, 03:16 AM   #68
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Carlos,

Digikey have stock of 3 caps in the 15mF/63 volt range B41560 ($21 ea), B41456 (U$17ea) and B41554 (U$46ea) - they are all a better replacement than the original United Chem but not sure of the different sizes - naturally, the higher priced B41554 would be regarded as the better caps but in practice, the B41456 just sound a bit heavier in the bass, appearing perhaps a bit 'slower' in the sound - not much in it that a bit of tweaking elsewhere could compensate for - all these caps have much bigger 'punch' than you'll get with the United Chems and probably never need to replace them

In my opinion, the BHCs are really good caps and seem to excel at midrange presentation so appear to be a bit thin in the bass - this might suit the 5M20, but I'm a bit doubtful

Kendeils are well respected caps but I don't have any first hand experience - I think 'umut' had some in his listing awhile back

I hope this is of use to you ....
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Old 12th January 2017, 09:19 AM   #69
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Thanks, James. Your comments are extremely useful.

At the time of its release, the Luxman 5M20 was considered one of the best power amps in the world. Its parts were hand picked and the United Chem caps certainly were picked for its qualities, not their price.

I agree that now the Epcos sound like a great option, in any of their types.

The amp is not mine, and I'm helping a friend with that. It's quite likely he will pick the Epcos, I think.
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Old 12th January 2017, 10:23 AM   #70
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I don't think you could go far wrong with any of those Epcos caps - I was going to suggest maybe increasing the 15mF up to 22mF (if they'll fit, etc, etc ) but I doubt much advantage - if the budget would stretch that far, I would suggest going for the Sikorel (long life) ones, the B41554 - these are similar, maybe replacement, to the B41550's, I think

I haven't been much of a fan of the Mundorfs - either far too expensive or too fat in the bass - I would probably use those F&Ts which sound similar to me and much more reasonable price and just increase the voltage one step.

There used to be quite a few good USA caps that'll also do the job - they don't seem to attract much interest here on this site for some reason - not sure what's available these days as the names seem to change a bit
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