Krell KSA 100mkII Clone

[Fix]

Since we can add or change what we want, we surely can change the fan ?!

But I will use 2pcs for my stereo amp, 1 heatsink for each channel.
8x T0-3's per channel.


Also I can order the heatsink in rawprofile 1 meter for those who want to make their own heattunnel.

 

[Fix]

Made a little pcb for the "Output Relay Module"
Haven't tested it yet, but I've checked it three times.

If you finds any faults, or how to improve it, let me know.



Output Relay Module v0.1
"see attached file"

 

[Fix]

Made a little PCB "Power Control Module"
First version, any ideas are welcome.

Don't know if anyone make these, but I didn't found any.




Power Control Module v0.1


Made in Eagle Light, all files can be posted.
Q203 & Q204 can have a Heatsink if needed.

 

[Flodstroem]

I just got quote from Avel US:



Looks like I'm going to order from Antek

Or should you enjoy our GB for the original Krell transformer for the price of

$ 308/unit for to get the real original sound

Regards

 

[stolbovoy]

Or should you enjoy our GB for the original Krell transformer for the price of

$ 308/unit for to get the real original sound

Regards

I'll make one more try with toroid.com.

I reduced specs to bare minimum:

Primaries:
dual 120V

Secondaries (total 5 windings)
bifilar 2x 38V RMS at 12A RMS (39.5V 0a)
bifilar 2x 60v RMS at 0.8a
single 18v x 0.8a

STATIC SHIELD between primaries and secondaries.
MAGNETIC SHIELD = 70mm

Will wait for the quote

 

[stolbovoy]

Here is new quotes from toroid.com:
2-4 pcs: $362.52
5-9 pcs: $250.93
10 and more: $209.93

Who's interested?

 

[rjkdivin]

Here is new quotes from toroid.com:
2-4 pcs: $362.52
5-9 pcs: $250.93
10 and more: $209.93
Who's interested?

Well, I am interested at the $210 price......even though I have yet to finish my KSA50, and haven't gotten past populating my boards for the KSA100.
Robert

 

[hsu]

Thanks to Bob Gregor..

I received boards...Thanks Bob.

Hsu

 

[stolbovoy]

Well, I am interested at the $210 price......even though I have yet to finish my KSA50, and haven't gotten past populating my boards for the KSA100.
Robert

I'll started new list on the GB thread
http://www.diyaudio.com/forums/showthread.php?postid=1501112#post1501112
rjkdivin, I specified 2 for you. Am I correct?

 

[Jozua]

KSA100.2 versus 150

Gentlemen

Some time back I made a posting re the sonic attributes about a Krell 150. My initial impression was the KSA100.2 was better.

We had some thunder and rainstorms in Cape Town and somehow it must have triggered the amp to switch on whilst I was at work. Needless to say I came home and the amp was cooking hot.

I started listening and I was extremely impressed. I have not heard a amp sound so good in a long time. I have to withdraw my previous comments. This amp is stunningly good.

Now I am just wondering what will happen if I leave the KSA100.2 on for a day....

On a more serious note- does anybody have an explanation how this process works ?

Regards to all

Jozua

 

[jacco vermeulen]

The last goldplated MK-G KSA100 boards have found a home, the very posh KSA builders club now includes a Bulgarian member.

Just a reminder :
anyone with a desire to build the KSA100-MKII is welcome to contact me for 1N5309 CRD's, still plenty left for a number of stereo sets.
(i sell fish too, though the mackerel is a bit off lately)

 

[samoloko]

I would like to know If there are preferable sets of mosfets - irfd, zetex A, G, or smd
and also are these good for output http://www.mospec.com.tw/pdf/power/MJ15003.pdf

 

[K-amps]

The 15003/4 are 70's technology and they will work... but only you have nothing newer available.

Their DC gain at 5A is a good 60% lower than 80's/ 90's stuff like mj21193/4/5/6, but they are better than the 15024/5 in that regard.

 

[samoloko]

15003/4 are the original fets for that amp
I just like to know about that manufacture mospec is it ok
also if there are better outputs for use with sa968 and sc2238 and mje15030 and mje 15031 to use please don't shy to tell

 

[K-amps]

please don't shy to tell

Why would we shy.... they were the original "FET's" right?

 

[Fix]

Nice weather is not good... not for projects..

For those who is interested in Heatsink and Trafo, please sign up at the Groupbuy page.

 

[stolbovoy]

What is a good source for hook up wire for output stage of this project? I'm like to use something like 10-12 awg OFC in teflon jacket.

 

[jacco vermeulen]

Mr. Steve Slater, ApexJr.

 

[stolbovoy]

Mr. Steve Slater, ApexJr.

Jacco,

Do you mean "PTFE Silver Plated Copper Wire"? Is it silver plated OFC?

 

[troystg]

No he means "da man" Steve over at apexjr.

http://www.apexjr.com/
http://www.apexjr.com/wire.html

Yes he has that Silver plated copper cable insulated with that taboo word stuff..

He also has some small conductor co-ax and shielded twisted pair for the signal input too!