What is a CCS - how do you design one?

[Mosquito]

which are the criteria to decide for the use of a mosfet cascode CCS (like the two DN2540 by Sy) or a Gyrator

Ok, perhaps the sense of my question was not clear. My apologies for that. What I intended to ask is when it iis preferable to use a gyrator in place of a CCS, and viceversa.
(Wavebourn wrotes.."For plate loads gyrators are sometimes preferable.")
Thanks
JJT

 

[Wavebourn]

Gyrator allows me to set and stabilize plate voltage without other means.

 

[nigelwright7557]

Hi All --

I am working on a 6as7 tube amp in another thread with some helpful folks. The topic of using a solid state Constant Current source (CCS) consisting of a couple of transistors has come up. What is this CCS thing and how why does it increase the "swing" of the audio signal? I know a little bit about tubes at this point (long ways to go) but know next to nothing about solid state stuff. Is this technology worth my brain cell bandwidth?? thanks.

A simple resistor always has the same resistance so when the signal goes close to the rail you get very little current but on the other phase you get much more current.
To get around this problem we use a CCS that has a constant current which is equal to teh average current through the resistor cct.