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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: we agree on the bit about the OPT at least.

The distortion products are always there regardless of the power...they are just not visible below the noise floor. What you mean is that they rise above the noise floor with > 20-25% power (maybe...again depends on the specific amp). Does this mean they are now audible? Not necessarily. The sensitivity to higher order harmonics is dependent on the SPL level and so just because they rise above the noise floor doesn't make them immediately audible. If the rise is linear with power increase then they could easily remain inaudible as the low orders are also rising and will provide masking. The problem comes if the high order harmonics are rising at a faster rate than the lower order harmonics thus disrupting the pattern that was set at low power.




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