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In Reply to: RE: Cary SLP 98P question posted by jsm71 on July 26, 2014 at 15:13:24
"Buffer" sections are typically named that because they usually have no gain and "buffer" the output by lowering the output impedance. The most common way of doing this is using the tube as a cathode follower. Since there is no gain, you do not need to go nuts on the primo NOS tubes, a good functioning EH will work and sound just as well as anything, IMO.
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With preamps where I have swapped tubes (not including the Cary 98), the cathode follower tube is as sensitive to tube rolling as gain tubes. With the Hagerman Cornet phono for instance many people on the Hagerman forum said the cathode follower was actually the most sensitive.
That is interesting. There is no telling how each design is running their cathode followers. Some designs run them pretty low current for extra life. In that situation they could be more sensitive as there are some tubes that are more linear than others at the extremes of the tube curves.
When I want to use a cathode follower, I just use a MOSFET source follower because it is better at it. Talk about being able to make current...
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