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In Reply to: RE: Point taken but.... posted by Tre' on May 28, 2017 at 13:02:23
The Rp of the tube has almost no effect when it's driving a MOSFET follower. Nearly all the AC signal current to the load is supplied by the MOSFET. That's what sets the output impedance.
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This exercise gave me a chance to review the current paths for these various configurations. I had forgotten that signal current in the cathode follower flows through the power supply. That means it's important to have a good quality cap in the last position, and to be sure the cap's full potential isn't degraded by semiconductors or poor quality components upstream. Maybe this is another reason some CFs have an unpleasant sound. A common cathode stage with a CCS or anode choke wouldn't be vulnerable to this.
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