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Smeared?

OK, so I think by "smeared" or "Choir effect" people here mean to say that a second signal is produced due to the unmatched delay of the two tube sections?

Essentially adding a delayed signal back to the un-delayed signal which would produce an echo effect? Right?

Yet nobody to date has shown us the output of such a circuit on a scope where a delay would be very obvious!

Can't be measured? I disagree. We can easily measure time differences down to the pico-seconds on commodity bench scopes. Yet in order to hear such a delay, we are talking tens of not hundreds of milliseconds. That's based on our hearing deficiencies.

Furthermore when you consider the physics in tube construction, the standard manufacturing tolerances are magnitudes lower than would be required to produce such a long electrical delay.

This is layman's logic! Plain and simple. There is no evidence of this phenomenon that can be measured and quantified - because it doesn't exist at audio frequencies.

I don't doubt people hear things they don't like when paralleling tube sections. But I have to ask if the circuit parameters have been adjusted for the good old LCR changes the additional tube section makes? because that's most likely what you are hearing.

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