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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: What makes a good cathode follower tube posted by Gofast on April 24, 2007 at 07:19:27:
Due to the cathode resistor, CF stages have a bunch (almost 100 %) of negative feedback. That makes the characteristics of the tube itself relatively unimportant. And it's probably why ARC puts the lowest-grading tubes there, and why you find "farting/hissing" tubes to be okay: The farting and hissing are largely nulled by negative feedback. Why some tubes sound bright to you I don't know. Impedance matching sounds incorrect. Cathode followers (in audio circuits) are about looking like close to a zero impedance source to the load that follows, not about matching impedance (that's done in RF work to maximize power transfer).
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- My guess... - lipmanl 11:52:33 04/24/07 (0)
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