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-   -   cathode follower (http://www.diyaudio.com/forums/tubes-valves/54020-cathode-follower.html)

vlljpior 22nd March 2005 04:42 PM

cathode follower
 
hi, i want to know if the cathode follower is a gain stage.

If i have a 4 gain stage preamp + a cathode follower, do i have 5 gain stage ?

SY 22nd March 2005 04:44 PM

There's no voltage gain, but there is sometimes power gain.

Sch3mat1c 22nd March 2005 05:44 PM

Yep. Whether or not you want to count it as a "stage" is up to you... or more importantly, how you connect it. Say you take NFB off the output; an extra coupling capacitor (to the CF) will give you trouble, however a cathode follower can be direct coupled easily, making an essentially invisible (electrically) buffer.

But that's an answer much too specific for such a vague question. I'd rather say something nonsensical like "battle of new orleans" in response. :D

Tim

vlljpior 22nd March 2005 05:58 PM

SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?

ThorstenL 22nd March 2005 06:24 PM

Konnichiwa,

Quote:

Originally posted by vlljpior
SO, THIS SCHEMATIC HAVE HOW MANY GAIN STAGE 3 OR 4 ?
Neither, gain stages in total 5 plus one cathode follower, which is not strictly a gainstage in the of voltage gain, but a stage with power gain, so really the answer is 6!

Sayonara

SY 22nd March 2005 07:17 PM

:captain:

I've deleted the schematic since it appears to be the copyrighted drawing of someone else. If you have permission from the owner to post this, let me know and I'll put it back up.

vlljpior 22nd March 2005 07:50 PM

Sorry, i didn't realize that. I used this schematic because is the one that i found with the spec i need to be explain.

Sorry...


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