Schematics for Krell KSA200S

Rainer Weber · 1st October 2001, 12:24 PM

Hello everybody,
has someone the schematics of this Krell amp. (or similar)
Im interested who the different bias level is working in detail.
regards
Rainer

ricbed · 10th April 2011, 01:51 AM

Hi I am looking for the Krell Ksa200S schematics, I have a rare problem, driver transistors are hot very quickly and relays in both channels are sounding click and click.

Any help will be apreciate.

Thanks

computerwala · 20th December 2011, 04:57 PM

Sounds like you have have a thermal overload / DC voltage on output issue. You need to check all the Power transistors and also reseat them on the Heat sink with new washers. The old washers become brittle after 20+ years of use. You can also measure the DC on the Output Relay to see if the clicking happens when the offset voltage reaches a certain limit.

AudioSan · 05:19 PM

i have the service manual with schematic for Ksa200B
send me PM with mail.

Dr.H · 21st December 2011, 05:58 AM

the ksa200S and ksa200B are two very different amplifiers...
the s used sliding bias while the b was a simple class A design

CarCar · 17th December 2012, 09:11 PM

Hi ,Sorry my english, I Had krell amplifier, bias is very high, need schematics for fix it,
my Email is ccarrascal@hotmail.com
Thanks

20th December 2011, 05:13 PM	#4
AudioSan diyAudio Member Join Date: Feb 2009 Location: Trondheim	i have the service manual with schematic for Ksa200B send me PM with mail. __________________ aleph P1.7 pre. F5 power amp. CDpro2(need DAC). Vivaldi8 speakers Last edited by AudioSan; 20th December 2011 at 05:19 PM.

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1st October 2001, 12:24 PM	#1
Rainer Weber diyAudio Member Join Date: Aug 2001 Location: Germany	Hello everybody, has someone the schematics of this Krell amp. (or similar) Im interested who the different bias level is working in detail. regards Rainer

10th April 2011, 01:51 AM	#2
ricbed diyAudio Member Join Date: Apr 2011	Hi I am looking for the Krell Ksa200S schematics, I have a rare problem, driver transistors are hot very quickly and relays in both channels are sounding click and click. Any help will be apreciate. Thanks

20th December 2011, 04:57 PM	#3
computerwala diyAudio Member Join Date: Oct 2008 Location: Chicago	Sounds like you have have a thermal overload / DC voltage on output issue. You need to check all the Power transistors and also reseat them on the Heat sink with new washers. The old washers become brittle after 20+ years of use. You can also measure the DC on the Output Relay to see if the clicking happens when the offset voltage reaches a certain limit.

21st December 2011, 05:58 AM	#5
Dr.H diyAudio Member Join Date: Apr 2002	the ksa200S and ksa200B are two very different amplifiers... the s used sliding bias while the b was a simple class A design

17th December 2012, 09:11 PM	#6
CarCar diyAudio Member Join Date: Jul 2007	Hi ,Sorry my english, I Had krell amplifier, bias is very high, need schematics for fix it, my Email is ccarrascal@hotmail.com Thanks