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In Reply to: RE: CCS and SRPP posted by Tre' on February 27, 2025 at 17:18:11
...mean what Tre' said.
Follow Ups:
I thought the C4S had no low output Z capability?
For sure, put a single MOSFET in place of that triode, and it can still have the source/cathode output. Make it even 'harder' by adding a second in cascode. With the advent of 1kV depletion-mode 'FETs, the 10M90 is not needed anymore...LOL
Or build a cascode with a triode on bottom and a pentode on top. Couple voltage ref's to separate them by enough voltage to do the job and give it a BIG 'R-set' resistance... :)
cheers.
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
My mistake; I was only considering taking the output from the lower plate. Some 20+ years ago, we decided that sounds better than the mu follower, and I haven't re-visited that conclusion since.
So, the mu follower current source is a moderate current source, and the solid-state current sources are by and large superior - if the output is taken from the lower plate. The half-mu stage with a choke at the upper cathode does have two available outputs, as does the full mu-follower. The choke does not have to be large, since its inductance is effectively multiplied by mu.
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