Cambridge Audio 740A topology

lduarte1973 · 24th May 2011, 09:05 AM

anyone knows what is the topology of this amp ? is it a gainclone ?

Andy5112405 · 24th May 2011, 09:18 AM

Take the lid off and have a look.

lduarte1973 · 24th May 2011, 09:35 AM

I can it´s still under warranty for the next 4 months , i only know the topology is similar to the 640A

alexcp · 24th May 2011, 10:39 AM

640A is not a gainclone, it is a version of the "blameless" amplifier developed by Douglas Self and uses discrete bipolar transistors throughout.

lduarte1973 · 24th May 2011, 02:51 PM

I guess that means it´s a good amplifier ? i read god and bad things about " blameless " amplifiers.

alexcp · 27th June 2011, 07:32 AM

It's subjective. The concept of the blameless amplifier is the systematic design approach to minimize measurable distortion, particularly in the three stage amplifier topology, to the level determined by the components and physics, not design choices - hence it is "blameless", not "perfect". Whether this results in pleasing sound is a different issue.

24th May 2011, 09:05 AM	#1
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Cambridge Audio 740A topology anyone knows what is the topology of this amp ? is it a gainclone ?

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24th May 2011, 09:18 AM	#2
Andy5112405 Banned Join Date: Nov 2006 Location: Torpoint	Take the lid off and have a look.

24th May 2011, 09:35 AM	#3
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	I can it´s still under warranty for the next 4 months , i only know the topology is similar to the 640A

24th May 2011, 10:39 AM	#4
alexcp diyAudio Member Join Date: Jun 2009 Location: Florida Blog Entries: 35	640A is not a gainclone, it is a version of the "blameless" amplifier developed by Douglas Self and uses discrete bipolar transistors throughout.

24th May 2011, 02:51 PM	#5
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	I guess that means it´s a good amplifier ? i read god and bad things about " blameless " amplifiers.

27th June 2011, 07:32 AM	#6
alexcp diyAudio Member Join Date: Jun 2009 Location: Florida Blog Entries: 35	It's subjective. The concept of the blameless amplifier is the systematic design approach to minimize measurable distortion, particularly in the three stage amplifier topology, to the level determined by the components and physics, not design choices - hence it is "blameless", not "perfect". Whether this results in pleasing sound is a different issue.