CCS and regulated B+

Nikon1975 · 21st May 2010, 06:58 AM

Dear All,

Basic question: If I have a driver stage with led bias and CCS, does it make any sense to have a regulated B+ ?

It should not really matter for the tubes, as no matter what the plate voltage and current will be always the same, is it correct ?

Thanks,

D.

Arnulf · 21st May 2010, 08:02 AM

You are correct, as long as CCS dioesn't hit its supply "ceiling" in operation.

SY · 21st May 2010, 11:08 AM

Non-critical, no. Much less critical, yes. This topology will have a power supply rejection of approximately the ratio of the CCS source impedance to the plate resistance. A quick calculation will show you how quiet/stable the supply needs to be.

21st May 2010, 06:58 AM	#1
Nikon1975 diyAudio Member Join Date: Nov 2009 Location: Tokyo	CCS and regulated B+ Dear All, Basic question: If I have a driver stage with led bias and CCS, does it make any sense to have a regulated B+ ? It should not really matter for the tubes, as no matter what the plate voltage and current will be always the same, is it correct ? Thanks, D.

21st May 2010, 08:02 AM	#2
Arnulf diyAudio Member Join Date: Feb 2009	You are correct, as long as CCS dioesn't hit its supply "ceiling" in operation. __________________ mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."

21st May 2010, 11:08 AM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Non-critical, no. Much less critical, yes. This topology will have a power supply rejection of approximately the ratio of the CCS source impedance to the plate resistance. A quick calculation will show you how quiet/stable the supply needs to be. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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