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leffe 14th May 2002 01:56 PM

Krell KSA 100 type amplifier

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.

hifi 14th May 2002 02:09 PM


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



mlloyd1 14th May 2002 02:45 PM

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
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!:)


fcel 14th May 2002 03:02 PM

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 .....

leffe 14th May 2002 05:56 PM

Krell type schematics

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



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


/micke [/B][/QUOTE]

Nelson Pass 14th May 2002 09:05 PM


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.

webercarbmann 14th May 2002 10:05 PM

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.



leffe 15th May 2002 06:45 AM


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


Elso Kwak 15th May 2002 07:29 AM

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,

sonnya 15th May 2002 07:49 AM

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.


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