A Krell Revamp

CheerfulYC · 17th February 2004, 06:30 AM

To all my DIY friends out there .... do any of you happen to have the schematic for Krell's KSA200 power amp? I had kept this amp in the closet for years and thought it is time to give this amp a new "heart" for the new millennium. Any wild thoughts and ideas are all welcome ...... thanks folks!

lucpes · 17th February 2004, 01:44 PM

I'm afraid that this is already way better than 95% of the new commercial offerings out there.

Plug it in and enjoy the music

Nelson Pass · 17th February 2004, 04:50 PM

Well, we have a posting on the www.passdiy.com site with
a project where the guy took a KSA250 and put an A40 in it.

KBK · 17th February 2004, 06:26 PM

I've always wanted to strip downa Krell and make it into something that finally sound OK. Maybe even good, if the circuit and desgin can handle it.

It probably wouldn't tke much. Just fix the dammned thing......OK,ok.. So I'm biased and I don't care for the sound of Krell...at all. If I had to choose between it and a Nikko power amp.. I might just choose the Nikko. (If I had to live with the stock sound)

Nelson Pass · 17th February 2004, 06:37 PM

I have saw some really gorgeous Nikko amps years ago, but
only in Japan. Big Class A mothers.

KBK · 18th February 2004, 12:55 AM

I'm gettin' a pair of 600's or better sometime in the next year or so Mr. Smartie Pass dude.... Yer next on my little chopping block.

Only after I pick on a pair of Mr. Mike Elliot's SA-220's I bought as a bit of a warmup.

Yes. Anyone can find a way to improve the next guy's gear. Always have, always will....

Hhmmmmm what can I do to the 600's? Don't know.. I ain't got 'em yet...

The Nikko Class A units sound interesting in a japanese constrained dynamics kinda way.

The fun part about the Nikko's is that I always said that they could be made to sound really good with a few simple modfications that take care of their major shortcomings..like a freaking $0.02 capacitor for signal coupling on the feedback loop? Who the hell made that decision! Idiot! (SMACK!....) anyway.. I sorta likened their sound to say.. a Bryston, for example. Then I speak to my buddy..and.. it seems ST made a modded Nikko for a Oscar winning recording engineer friend of ours..this is before or near the start of ST's stay with Bryston. But I'm telling tales out of school now.. so I'd better stop.

KBK · 18th February 2004, 01:12 AM

As for the Krell.. we need internal shots. lots of them. half of the battle is wiring vs bus bars, mechanical work, etc. Krells, for example, have absoutley gawdawful mechanical work. Ring like a freaking bell with a decay tail that has no end. the Heatsinks ring so badly, that bell makers should go to Wakefield and take lessons!!!!. No wonder they sound so damned bad. Had a pair of 160 monos in the house one day. They lasted about 48 hours in the houe,and about 10 hours listening. Then they were booted. big time. Couldn't stand them any more. Just awful.

Peter Daniel · 18th February 2004, 01:39 AM

Some info could be found here:
Running the KSA-100 in Class A/AB?
Krell KSA 100 schematic, resistor value question

17th February 2004, 06:26 PM	#4
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	I've always wanted to strip downa Krell and make it into something that finally sound OK. Maybe even good, if the circuit and desgin can handle it. It probably wouldn't tke much. Just fix the dammned thing......OK,ok.. So I'm biased and I don't care for the sound of Krell...at all. If I had to choose between it and a Nikko power amp.. I might just choose the Nikko. (If I had to live with the stock sound) __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

18th February 2004, 12:55 AM	#6
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	I'm gettin' a pair of 600's or better sometime in the next year or so Mr. Smartie Pass dude.... Yer next on my little chopping block. Only after I pick on a pair of Mr. Mike Elliot's SA-220's I bought as a bit of a warmup. Yes. Anyone can find a way to improve the next guy's gear. Always have, always will.... Hhmmmmm what can I do to the 600's? Don't know.. I ain't got 'em yet... The Nikko Class A units sound interesting in a japanese constrained dynamics kinda way. The fun part about the Nikko's is that I always said that they could be made to sound really good with a few simple modfications that take care of their major shortcomings..like a freaking $0.02 capacitor for signal coupling on the feedback loop? Who the hell made that decision! Idiot! (SMACK!....) anyway.. I sorta likened their sound to say.. a Bryston, for example. Then I speak to my buddy..and.. it seems ST made a modded Nikko for a Oscar winning recording engineer friend of ours..this is before or near the start of ST's stay with Bryston. But I'm telling tales out of school now.. so I'd better stop. __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

18th February 2004, 01:12 AM	#7
KBK diyAudio Member Join Date: Dec 2003 Location: The Wilds Of Canada	As for the Krell.. we need internal shots. lots of them. half of the battle is wiring vs bus bars, mechanical work, etc. Krells, for example, have absoutley gawdawful mechanical work. Ring like a freaking bell with a decay tail that has no end. the Heatsinks ring so badly, that bell makers should go to Wakefield and take lessons!!!!. No wonder they sound so damned bad. Had a pair of 160 monos in the house one day. They lasted about 48 hours in the houe,and about 10 hours listening. Then they were booted. big time. Couldn't stand them any more. Just awful. __________________ "Never forget that only dead fish swim with the stream." -- Malcolm Muggeridge. "Truth cannot be brought down, rather the individual must make the effort to ascend to it." -- Jiddu Krishnamurti

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17th February 2004, 01:44 PM	#2
lucpes diyAudio Member Join Date: Dec 2003 Location: Iasi	I'm afraid that this is already way better than 95% of the new commercial offerings out there. Plug it in and enjoy the music

17th February 2004, 04:50 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Well, we have a posting on the www.passdiy.com site with a project where the guy took a KSA250 and put an A40 in it.

17th February 2004, 06:37 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	I have saw some really gorgeous Nikko amps years ago, but only in Japan. Big Class A mothers.

18th February 2004, 01:39 AM	#8
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Some info could be found here: Running the KSA-100 in Class A/AB? Krell KSA 100 schematic, resistor value question

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