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#1 CCS topologies

Posted: Wed Mar 03, 2021 3:42 pm
by Wolfgang
Don't now if "topology" is the right term here. I was wondering if there is any noticeable difference in how it sounds using a voltage regulator vs a current regulator. Or: why would one use all those extra parts for replacing a 10k/2k (elysium) resistor if a TL738 could be used ?


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#2 Re: CCS topologies

Posted: Wed Mar 03, 2021 7:39 pm
by rowuk
RH Amplifiers by Alex Kitic use LM317s with excellent sonic results. I have built 4 of his amps, based on the 307A and EL84. Alex says that this removes the need for matching/biasing tubes. http://rh-amps.blogspot.com/2013/05/rh- ... ersal.html

I would also ask why so many more parts.

#3 Re: CCS topologies

Posted: Sat Mar 06, 2021 8:41 am
by Paul Barker
Not in the two examples above as they’re both reasonable current. But you can’t use a constant current sink on low transconductance valves.

#4 Re: CCS topologies

Posted: Sat Mar 06, 2021 3:51 pm
by Wolfgang
But you can’t use a constant current sink on low transconductance valves.
Ok, but my question was going in the direction of what difference it makes using a current regulator vs a voltage regulator. And JBroskie uses both together which makes it even more difficult to understand in case it is about different levels of distortion.

Like in pmillett's test but with the 10M45S as CCsource vs a resistor.
http://www.pmillett.com/current_source.htm