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Old 4th December 2009, 08:03 PM   #1
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Default 8000uF MKP Caps for Krell MRA = Master Reference Amplifier - Schematic wanted

I need a detailled schematic diagram from the power amplifier about
Krell mra image by MrAcoustat on Photobucket
developed from
http://www.audioreference.de/content...c_krell_01.jpg

Here some additional weblinks about this power amp:
StereoTimes - Event - A Visit to Krell by Steve Ekblad
http://www.premieraudio.ca/uploads/images/MRA_Amp.jpg
http://www.audio-kontakt.com/forum/n...Krell_MRA3.jpg
www.audio-kontakt.com :: Poglej temo - Trafo in watti (scoll down for three additional photos)

I need it for calculate a new ultimate quality (external) power supply for a currently user. There are Wilson Audio X1 (X-1) loudspeakers in use like the follow
http://bedzine.com/blog/wp-content/u...2_vl3ls_12.jpg

Because there are now big monolitic MKP capacitors (8000 uF !!!) in ultimate quality on the market, a great enhancement in sonic quality must be possible (compare to the original conditions).
http://www.powersmartsystems.ru/file...nk/LNK-P5X.pdf
I have even heard about monothitic 50.000 uF MKP, unfortunately I haven't see, because this must be custom made devices in very large sizes.

Unfortunately one must be calculate very high costs for such cases (much more than the best available electrolytic capacitors) and it must be present absolutely perfect inrush current limiting devices (because internal resistance near zero ohms).

Due such high costs by this kind of capacitors even by the world's most expensive amplifier such capacitors are not in use, e. g. FM Acoustic, Ultrasound, Audionote, Goldmund, Halcro and some more - look about
HigherFi-Ultimate - The Worlds Best and Most Expensive Audio Amp and Amplifier
Therefore the highest possible sonic quality is still hard limited, regardless of the price range and and regardless of the advertising slogans

I am very happy to get a service manual (at least a schematic about power supply)
of the Krell "Master Reference Amplifier" to realize this power supply project

Last edited by tiefbassuebertr; 4th December 2009 at 08:08 PM.
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Old 5th December 2009, 09:03 PM   #2
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Here some additional MKP capacitors up to 24000 uF ( !!! )
Attached Files
File Type: pdf Rectangular MKP - 1.pdf (24.1 KB, 557 views)
File Type: pdf Rectangular MKP - 2.pdf (66.4 KB, 273 views)
File Type: pdf Rectangular MKP - 3.pdf (163.1 KB, 292 views)
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Old 19th April 2010, 10:26 AM   #3
Luke is offline Luke  New Zealand
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impressive, any idea where to get these?
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Old 20th April 2010, 12:47 AM   #4
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Quote:
Originally Posted by Luke View Post
impressive, any idea where to get these?
From there:
ELECTRONICON Kondensatoren und Filterkreis Drosseln > Home > HOME
cause the exhibition start "HANNOVER MESSE 2010" today try to ask in two weeks
ask there (button "Kontakt") for your local distributor
An English homepage version is now also available.

Service Manual for Krell "Master Reference Amplifier" still needed.

Last edited by tiefbassuebertr; 20th April 2010 at 12:52 AM.
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Old 11th May 2011, 08:24 AM   #5
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schematic for this amplifier still wanted
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Old 16th May 2011, 11:38 AM   #6
mr l is offline mr l  Australia
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krell don't release schematics, good luck!
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Old 16th May 2011, 11:41 AM   #7
h_a is offline h_a  Europe
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Quote:
Because there are now big monolitic MKP capacitors (8000 uF
With 18kg not really lightweight

Hannes

EDIT: if you have access to the amp, why not trace out the schematic and make everybody happy here?
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Old 16th May 2011, 06:15 PM   #8
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Quote:
Originally Posted by tiefbassuebertr View Post
schematic for this amplifier still wanted
This is the best I can find. There are 48 capacitors in total in the power supply. I think they are made by epcos.
Attached Images
File Type: jpg Krell MRA.jpg (13.4 KB, 517 views)
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Old 8th June 2011, 10:03 AM   #9
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Quote:
Originally Posted by mr l View Post
krell don't release schematics, good luck!
Even Accuphase release their schematics - go to
http://wegavision.pytalhost.com/accuphaseM-1000p/
perhaps one of the member have perform a "reverse engineering".

Last edited by tiefbassuebertr; 8th June 2011 at 10:05 AM.
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Old 8th June 2011, 10:16 AM   #10
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Quote:
Originally Posted by tiefbassuebertr View Post
Even Accuphase release their schematics - go to
Accuphase M-1000 Prospekt
perhaps one of the member have perform a "reverse engineering".
this is not a DIY amp, but thanks for the post
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