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In Reply to: RE: I could be wrong but... posted by tketcham on February 22, 2021 at 11:34:19:
"I'm not sure I agree with your assertion that a tube used to change impedance does not (or can not?) also impart tube euphonics in a buffer stage."
To be clear: I never intended to imply that nor was that my point. I said that some, particularly inexpensive Chinese buffers, intentionally bias the tubes so as to generate 2nd harmonic distortion instead of biasing them in their most linear region. A well engineered tube stage will generate H2 and H3 distortion well below the signal voltage so that it can be <1% at full output.
A quick example is the Western Electric table of operating points for the 300B. The H2 distortion, according to operating point, ranges from -18dB to -31dB below the signal. This is obviously a huge range of difference in distortion possible for this one tube.
My point again: some manufacturers intentionally create H2 distortion in their buffer product to give it a tubey bloom or euphonic sound and in reality that is its only application. To me, this is not hifi but noise generation.
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Follow Ups
- RE: I could be wrong but... - Palustris 13:39:02 02/23/21 (2)
- RE: I could be wrong but... - tketcham 15:30:18 02/23/21 (1)
- RE: I could be wrong but... - Palustris 08:41:02 02/24/21 (0)
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