Krell KSA 100mkII Clone - Page 242

RKH · 4th November 2009, 02:02 AM

Beautiful work. Great test results. Congratulations. I recognize those transformers

I trust they are doing the job?

Ryan

Mark Allen · 4th November 2009, 02:10 AM

WOW! Thats an amazing high quality build!!! Can you send me an 11X14 color glossy enlargement to hang on my wall??

Mark

a.wayne · 4th November 2009, 02:23 AM

Fit ,
Congrats and fantastic job , what was the power output @ 2 /1 ohm respectively ...

regards,

Fix · 5th November 2009, 06:39 PM

@ a.wayne..

Press on the pictures to zoom in, then you can see all outputs...

I have an official PowerCube reading for KSA-80B, will post results tomorrow.
KSA80, have similar effect in 8,4,2 Ohm, and KSA-100 have quite much more power in 1ohm

a.wayne · 5th November 2009, 06:44 PM

Hello Fix ,

Yes i did zoom in later and saw the output figures , Impressive ! again great work ..

Fix · 9th November 2009, 12:30 PM

Here are the KSA-80B Audiograph results.
Done by Swedish magasine Hifi & Musik, 1996

Same as did test mine...

We can see that the KSA-80 have more power in 8,4,2ohm and drops at 1ohm
KSA-100 have more power at 1ohm, and is more stable.
Also if we raise the bias to 625mv, I guess we get more power too..

KRELL KSA 80B

8Ohm
158W 60deg Cap
157W 30deg Cap
156W 0 deg
157W 30deg Ind
159W 60deg Ind

4Ohm
303W 60deg Cap
294W 30deg Cap
292W 0 deg
296W 30deg Ind
302W 60deg Ind

2Ohm
557W 60deg Cap
518W 30deg Cap
506W 0 deg
518W 30deg Ind
545W 60deg Ind

1Ohm
403W 60deg Cap
407W 30deg Cap
421W 0 deg
417W 30deg Ind
332W 60deg Ind

MCC POS: 70A
MCC NEG: 0A*

*could not measure ?

AndrewT · 9th November 2009, 07:35 PM

Quote:

Originally Posted by Fix

Also if we raise the bias to 625mv, I guess we get more power too..

no,
you get more bias current which in turn means you have more ClassA output current.

john65b · 9th November 2009, 07:42 PM

And all this power beyond the Class A max is all Class AB, correct??

AndrewT · 9th November 2009, 08:27 PM

yes ClassAB as soon as the peak current exceeds the ClassA output current.
For 2.6A bias the maximum ClassA current is ~5.1A and is good for 100W into 8r0 or 50W into 4r0 or 25W into 2r0.

a.wayne · 10th November 2009, 03:05 AM

Quote:

Originally Posted by AndrewT

yes ClassAB as soon as the peak current exceeds the ClassA output current.
For 2.6A bias the maximum ClassA current is ~5.1A and is good for 100W into 8r0 or 50W into 4r0 or 25W into 2r0.

How would one achieve class -A bias into 1 ohm ?

4th November 2009, 02:02 AM	#2411
RKH diyAudio Member Join Date: Sep 2002 Location: Colorado, USA	Beautiful work. Great test results. Congratulations. I recognize those transformers I trust they are doing the job? Ryan __________________ Lighten up while you still can ...

9th November 2009, 07:42 PM	#2418
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	And all this power beyond the Class A max is all Class AB, correct?? __________________ Pillage Before You Burn.

9th November 2009, 08:27 PM	#2419
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	yes ClassAB as soon as the peak current exceeds the ClassA output current. For 2.6A bias the maximum ClassA current is ~5.1A and is good for 100W into 8r0 or 50W into 4r0 or 25W into 2r0. __________________ regards Andrew T.

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4th November 2009, 02:10 AM	#2412
Mark Allen diyAudio Member Join Date: Jan 2008 Location: Bountiful, You-Taw	WOW! Thats an amazing high quality build!!! Can you send me an 11X14 color glossy enlargement to hang on my wall?? Mark

4th November 2009, 02:23 AM	#2413
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Fit , Congrats and fantastic job , what was the power output @ 2 /1 ohm respectively ... regards,

5th November 2009, 06:39 PM	#2414
Fix diyAudio Member Join Date: Feb 2008	@ a.wayne.. Press on the pictures to zoom in, then you can see all outputs... I have an official PowerCube reading for KSA-80B, will post results tomorrow. KSA80, have similar effect in 8,4,2 Ohm, and KSA-100 have quite much more power in 1ohm

5th November 2009, 06:44 PM	#2415
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Hello Fix , Yes i did zoom in later and saw the output figures , Impressive ! again great work ..

9th November 2009, 12:30 PM	#2416
Fix diyAudio Member Join Date: Feb 2008	Here are the KSA-80B Audiograph results. Done by Swedish magasine Hifi & Musik, 1996 Same as did test mine... We can see that the KSA-80 have more power in 8,4,2ohm and drops at 1ohm KSA-100 have more power at 1ohm, and is more stable. Also if we raise the bias to 625mv, I guess we get more power too.. KRELL KSA 80B 8Ohm 158W 60deg Cap 157W 30deg Cap 156W 0 deg 157W 30deg Ind 159W 60deg Ind 4Ohm 303W 60deg Cap 294W 30deg Cap 292W 0 deg 296W 30deg Ind 302W 60deg Ind 2Ohm 557W 60deg Cap 518W 30deg Cap 506W 0 deg 518W 30deg Ind 545W 60deg Ind 1Ohm 403W 60deg Cap 407W 30deg Cap 421W 0 deg 417W 30deg Ind 332W 60deg Ind MCC POS: 70A MCC NEG: 0A* *could not measure ?

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