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perhaps you can enlighten me? You are correct I've not been keeping up...

I know that to prevent phase shift as a designer you have two options. The first is to have wide bandwidth, the 2nd to have high feedback (+35dB). The latter isn't practical for tube amps and most solid state (insufficient gain bandwidth product, insufficient phase margins), so they have to go with the former.

To prevent phase shift at 20Hz you have to be flat to 2Hz. To go to 10KHz without phase shift you need to be flat to 100KHz.

Phase shift at a single frequency is inaudible. But over a spectrum of frequencies its perceived as a tonal coloration and can affect the soundstage presentation.

So are you telling me there are high power (+30 Watts) SETs out there that have full power bandwidth from 2Hz to 100KHz?? That would be really impressive; I know of very few P-P amps that can do that!

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