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Old 14th May 2002, 02:56 PM   #1
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Default Krell KSA 100 type amplifier

Hi,

Anybody who has seen the ads in the mid 80's TAA about krell type schematics and buy the secrets, can it be published here or maybe it is possible to buy a copy.
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Old 14th May 2002, 03:09 PM   #2
hifi is offline hifi  Sweden
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hello,

i got it on another computer and could possibly get it in the weekend or you could as svalander for it

(www.svalander.se)


/micke
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Old 14th May 2002, 03:45 PM   #3
mlloyd1 is offline mlloyd1  United States
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There was a guy named William C. Snyder who published a spiral book called "Class A Audio Design". Mr Snyder was an engineer at Krell for a while.

It wasn't a bad book. In my mind, nothing earth-shaking and I don't recall seeing any stated Krell product schematics. However, it's probably reasonable to assume there be a lot of similarities though.

It's written much in the style of a college course notes book. Circuits were complementary symmetry type, some talk about JFETs and MOSFETs as gain elements. Used discrete JFET input gain block as DC servo.

The copy I had was from 1990. The address at that time was:
New England Analog
Rt. 113A
P.O. Box 38
North Sandwich, NH 03259
(USA)
I wrote once to ask him a question and ask if PCBs were available for any of the circuits described. He said they would be, but I never heard anything else about it.

Hey, I'd be interested in seeing a schematic for the KSA100 myself. Not that I'd want to build it, but I'm a curious guy!

mlloyd1
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Old 14th May 2002, 04:02 PM   #4
fcel is offline fcel  United States
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Speaking of Krell, is it true that their amps uses very complicated circuit design? I say complicated because there are tons of components if you look inside the chassis. Also, does Krell allow diy like us to copy and use their circuit to built our own amps? Their old chassis design looks so beautiful and now their current product looks so .....
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Old 14th May 2002, 06:56 PM   #5
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Default Krell type schematics

Hi,

Yes please I am very interrested in this information please send me the info.

Regards

Leffe


i got it on another computer and could possibly get it in the weekend or you could as svalander for it

(www.svalander.se)


/micke [/B][/QUOTE]
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Old 14th May 2002, 10:05 PM   #6
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Quote:
Their old chassis design looks so beautiful and now their current product looks so ..... [/B]
Possibly because Desmond Harrington came to work at
Pass Labs in '97.
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Old 14th May 2002, 11:05 PM   #7
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Default Krell Clone

Hi There

I have actually made a Krell KSA100 MKII clone a few years ago.
It was build as monoblocks with 1200VA 40-0-40 transformers for each block. The schematics is not that complicated, but some af the original parts (Supertex fets) are out of stock and are not made annymore. The driver/output stage uses 2SC968/2SA2238, MJE15030/MJE15031, MJ15024/MJ15025. 8 otuput devices pr channel. I am working on a KMA 100 clone. I is should to be a lot better. It has a regulated pover supply for the input stage. Annyway the KSA 100 MKII curciut i originaly made was a VERRY good amp.


Peter

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Old 15th May 2002, 07:45 AM   #8
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Default Schematics

Hi,

It would be nice to get some schematic info about the krell KSA100 and KMA100

Leffe
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Old 15th May 2002, 08:29 AM   #9
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Question Krell KSA100 Schematic

Hi Peter,
I would appreciate it very much receiving the schematics of your clones of the Krell amplifiers KSA100 & KMA100.
I could not email you directly. but you can email me by clicking on the email button at the bottom of my post.
Thanks in advance,
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Old 15th May 2002, 08:49 AM   #10
sonnya is offline sonnya  Denmark
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Count me in, I would like to. By the way i have got my hands on Luxman M03 schematic. They use Japanese JFET's and BJT's. Funny it looks a bit like a d-self "blameless" amplifier.

Sonny
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