Krell KSA 100mkII Clone - Page 54

Lee1234 · 23rd October 2006, 12:37 AM

Heres my KSA 100 board

Mark A. Gulbrandsen · 23rd October 2006, 01:25 AM

Well, it gets a teenie weenie bigger if you click on it.... I hope the sound is larger than the picture....

.

Mark

Lee1234 · 23rd October 2006, 01:49 AM

Hows this

Mark A. Gulbrandsen · 23rd October 2006, 02:08 AM

Is that a MK-1 or a MK-2 board... Looks like a MK-1 to me. What devices did you use?

PWatts,

Can you measure the length of the KSA-100 heat sink tunnel for me? I have a 4 foot section of the stuff that I'm planning on using to build my pair.

Thanks!

Mark

PWatts · 23rd October 2006, 07:54 AM

Kudos to Lee1234 to building a Mk1 on such a small single-sides board. Layout's not completely optimal due to that marge MKP caps, but it would make a nice little headphone/tweeter amp. Hope the bias and offset remain stable with the bias transistor separate from the driver/output heatsink.

Mark, I'm continued to be amazed at your speed! Told you the Mk2 sounded good.. personally I wasn't too keen on the Mk1 (in my own system anyway, where I preferred a Rotel).

If I remember correctly Alex said here that Krell Germany has found bias ifor the Mk2 in the region of 380mA to be the optimal point sonic-wise. Perhaps that needs to be investigated so potentially save many builders unnecessary large transformers, caps and heatsinks. The Mk1 I serviced's bias was also reduced from 100W to 80W with no change to the sound, but a noticeable reduction in heatsink temperature and ripple.

The heat tunnels are exactly 100mm high. Must have been made in Europe since all the screws etc. are imperial sizes - a b*tch if you don't have complete sets of imperial sockets, wrenches and allen keys

My Mk2 is slowly coming back to life. Had to replace all the trimpots, drivers and output transistors on both channels, and the hookup wire with some fancy van den Hul stuff. Plus van den Hul interconnect wire, rejuvinating the protection and soft-start, SoniCaps on the rectifiers and a SoniCap on the mains at the transformer' primaries.

Mark A. Gulbrandsen · 23rd October 2006, 11:06 AM

Well, having that old Cerwin Vega amp really helped me get things done alot faster. The second board is also assembled as well but I have to machine the second sink. Next weekend I should have both channes playing. ONe thing about the 100 that thr 50 is lacking is the ability to shake things in other rooms of my house....amazing LF control and response that just is not there in the 50

.

Mark

Jozua · 23rd October 2006, 12:39 PM

Gentlemen

It so nice to see the Krell magic I grew up with beginning to kick in again. It going to be really interesting to see how big this wave is going to get?

With a better board layout- top notch components and better wires I would not be surprised if the new boards outperform the originals.

I wonder how many KSA50 clones will soon be running with the new KSA100 mk2 boards?

Jozua

Alex helge · 23rd October 2006, 01:32 PM

Hi,

I will change the power capacitors in the KSA 100 MK 2.
The Sprague Powerlytic 36DE on the KSA 100 is unavailable !
It´s of 1987.
Sprague Powerlytic 36DE
40000 - 90DC
8747L 4301
Made in USA
+ 95 C

What´s extra or difference to other capacitors ?
Is the Sprague very good ?
What can I to use for a good capacitors ?

Best regards Alex

PWatts · 23rd October 2006, 01:45 PM

Try the new ones from Sprague or BC Components at Vishay. You can get 47000uF at the same diameter but a few cm shorter than the originals.

Jozua · 23rd October 2006, 01:57 PM

Hi

Does anybody know who supplies Krell with their capacitors ?

Jozua

23rd October 2006, 12:39 PM	#537
Jozua diyAudio Member Join Date: Aug 2003 Location: Cape Town	Congratulations - it beginning to look very good.. Gentlemen It so nice to see the Krell magic I grew up with beginning to kick in again. It going to be really interesting to see how big this wave is going to get? With a better board layout- top notch components and better wires I would not be surprised if the new boards outperform the originals. I wonder how many KSA50 clones will soon be running with the new KSA100 mk2 boards? Jozua

23rd October 2006, 01:32 PM	#538
Alex helge diyAudio Member Join Date: Oct 2002 Location: Germany	Krell KSA 100 Mk 2 Spague capacitors Hi, I will change the power capacitors in the KSA 100 MK 2. The Sprague Powerlytic 36DE on the KSA 100 is unavailable ! It´s of 1987. Sprague Powerlytic 36DE 40000 - 90DC 8747L 4301 Made in USA + 95 C What´s extra or difference to other capacitors ? Is the Sprague very good ? What can I to use for a good capacitors ? Best regards Alex

23rd October 2006, 01:57 PM	#540
Jozua diyAudio Member Join Date: Aug 2003 Location: Cape Town	Caps Hi Does anybody know who supplies Krell with their capacitors ? Jozua

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23rd October 2006, 01:25 AM	#532
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Well, it gets a teenie weenie bigger if you click on it.... I hope the sound is larger than the picture.... . Mark

23rd October 2006, 02:08 AM	#534
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Is that a MK-1 or a MK-2 board... Looks like a MK-1 to me. What devices did you use? PWatts, Can you measure the length of the KSA-100 heat sink tunnel for me? I have a 4 foot section of the stuff that I'm planning on using to build my pair. Thanks! Mark

23rd October 2006, 07:54 AM	#535
PWatts diyAudio Member Join Date: Jun 2003 Location: Bloubergstrand	Kudos to Lee1234 to building a Mk1 on such a small single-sides board. Layout's not completely optimal due to that marge MKP caps, but it would make a nice little headphone/tweeter amp. Hope the bias and offset remain stable with the bias transistor separate from the driver/output heatsink. Mark, I'm continued to be amazed at your speed! Told you the Mk2 sounded good.. personally I wasn't too keen on the Mk1 (in my own system anyway, where I preferred a Rotel). If I remember correctly Alex said here that Krell Germany has found bias ifor the Mk2 in the region of 380mA to be the optimal point sonic-wise. Perhaps that needs to be investigated so potentially save many builders unnecessary large transformers, caps and heatsinks. The Mk1 I serviced's bias was also reduced from 100W to 80W with no change to the sound, but a noticeable reduction in heatsink temperature and ripple. The heat tunnels are exactly 100mm high. Must have been made in Europe since all the screws etc. are imperial sizes - a b*tch if you don't have complete sets of imperial sockets, wrenches and allen keys My Mk2 is slowly coming back to life. Had to replace all the trimpots, drivers and output transistors on both channels, and the hookup wire with some fancy van den Hul stuff. Plus van den Hul interconnect wire, rejuvinating the protection and soft-start, SoniCaps on the rectifiers and a SoniCap on the mains at the transformer' primaries.

23rd October 2006, 11:06 AM	#536
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Well, having that old Cerwin Vega amp really helped me get things done alot faster. The second board is also assembled as well but I have to machine the second sink. Next weekend I should have both channes playing. ONe thing about the 100 that thr 50 is lacking is the ability to shake things in other rooms of my house....amazing LF control and response that just is not there in the 50 . Mark

23rd October 2006, 01:45 PM	#539
PWatts diyAudio Member Join Date: Jun 2003 Location: Bloubergstrand	Try the new ones from Sprague or BC Components at Vishay. You can get 47000uF at the same diameter but a few cm shorter than the originals.

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