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RE: 6SL7 Ratings

Hi,

> While flat at 20KHz the phase isn't.

Hmmm. And how flat is the phase of your speakers HF Unit at 20KHz?

Indeed, have you ever considered what the excess phase at 20Hz & 20KHz is for a hypothetical, completely flat in-band frequency response, crossover-less speaker is, which has -3dB points at 10Hz & 40KHz and the theoretically ideal 2nd order out of band rolloff of an ideal mechanical system (not that any such speaker exists anywhere in actual space/time)?

In the end we deal with complex systems and complex interactions. While I personally do like to maximise bandwidth prior to a well designed output transformer and use wideband speakers, I hold few illusions that that a few tens degree excess phase-shift from my electronics will be terribly noticeable once the amplifier has left the test-bench and is attached to speakers with often multiples of 360 degrees EXCESS phaseshift across the 20Hz - 20KHz bandwidth.

Ciao T

PS, the DC coupled 6SL7 SRPP driven Amp from J.C. Morrison I mentioned in the earlier thread is this:



Here the full "Fi-Primer" reproduced, with several interesting and proven designs:

This is an online version of the classic "Fi Primer", by J.C. Morrison, published with the kind permission of J.C. himself.

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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