Krell KSA 100mkII Clone - Page 231 - diyAudio
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Old 3rd April 2009, 07:46 AM   #2301
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Join Date: Jun 2006
are you going to stay with this transformers
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Old 4th April 2009, 08:27 AM   #2302
Fix is offline Fix  Sweden
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Join Date: Feb 2008
For the moment I will use DIYCable 1000VA trafo.
When the amp is ready and working I'll decide what to do.

The DiyCable trafo has all needed voltages and could be good enough...

- - -

Update:

Mounted the trafos at last, pictures will come..
AMP is now 33.5KG and guess it will be 35-40KG when done.
Just for a 100W amp :-)
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Old 7th April 2009, 08:10 PM   #2303
dwieck is offline dwieck  United States
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Does anyone have a pair of boards they are not going to use?
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Old 7th April 2009, 09:05 PM   #2304
Fix is offline Fix  Sweden
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Most of the metalwork is now done.
It's time to assmeble everything...

Some more holes are needed, but will drill them when I know where to place everything. It's not lots of space left now... :-)


Click the image to open in full size.

Click the image to open in full size.

My trafo solution, not nice but it works.
I tried to weld first, but the metal is unkown, and it did not work.
Also need to reinforce the bottom, due to the big trafos.

Don't ask me why there are that many holes...


Click the image to open in full size.

Click the image to open in full size.
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Old 9th April 2009, 01:11 AM   #2305
seafire is offline seafire  Mauritius
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WOW fix I have read every post on this thread!.Pierre from south africa started on a high and delivered....later mark dropped everyone.What I noticed however is that Pierre's audiophile buddy was going to get a full blast version and up to now havent heard a word....just continued ramblings about his genuine Krells .So please continue so we get a real working example 3 years down the line without someones self claimed audio ears laying comments all the time..BRILLIANT FINNISH THE PROJECT
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Old 9th April 2009, 07:43 AM   #2306
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browsing hifi2000.it pezante dissipante chassis I find http://www.modu.it/CARATTERISICHE_TERMICHE_DISS.pdf

they spec heatsink of 0.23 c/w to have max of 290 W dissipation
can I use It for passive cooling with krell clone 100 mk2
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Old 9th April 2009, 08:35 AM   #2307
Fix is offline Fix  Sweden
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Join Date: Feb 2008
@Seafire,

Thank you for your kind words...

It's been a long ride for this project, and now it looks like it will be finished atlast.

This is a real DIY Project where most parts needed had do be manufactuered by hand.

I think I've documented everything so I can reuse everything again to make more parts.

It's been fun, and time consuming... But worth it.


I'll keep you all updated..
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Old 9th April 2009, 08:47 AM   #2308
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
Quote:
Originally posted by samoloko
they spec heatsink of 0.23 c/w ...........................can I use It for passive cooling with krell clone 100 mk2
no.
You must de-rate the heatsink for the actual deltaT that will apply.
You must add on your ambient temperature.
You must de-rate your output stage devices for the actual Tc that applies.

With all this information and correction you will probably need a sink <=0.09C/W
__________________
regards Andrew T.
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Old 9th April 2009, 09:14 AM   #2309
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Join Date: Jun 2006
thx Andrew

In fact I will use one pair of Fix tunnels
but I like also to try passive cooling, do you think If I lower rails to 30 - 35 VAC I can use 2 pcs MF35-151.5 conrad heatsinks per channel - 4 pairs TO-247 transistors
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Old 9th April 2009, 02:06 PM   #2310
Jozua is offline Jozua  South Africa
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Location: Cape Town
Seafire

My project lost some steam after I took my monoblock heatsinks to an expensive metal shop and the quality of their work turned out worse than a DIY backyard job.

My preference now lies with the fan tunnels - due to their compactness. If I can find a set of fan tunnels - preferably larger than the standard Krell versions my project will be on track. If that fails I am scouting for a nice run down amp enclosure that could benefit from a Clone transplant. The last thing I want is to spend big bucks and put all of it in a crappy enclosure.

I suspect that once Fix provides feedback re the sound- everybody will get fired up again.


Regards

Jozua
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