Tube DIY Asylum: Re: Confessions of a plate choke convert & a few CCS questions (long) by Ken Gilbert Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by Ken Gilbert (A ) on June 4, 2002 at 07:11:52

In Reply to: Re: Confessions of a plate choke convert & a few CCS questions (long) posted by Lynn Olson on June 3, 2002 at 11:37:45:

"... and we all know distortion doesn't just go from zero to full."

lynn,

your observations wrt slew rate limiting are not exactly what i have found, namely in that slew rate limiting is a gradual effect; instead i have found that either a stage is SRL or it is not... either there is enough current to drive the downstream capacitance, or there isn't. when there is enough current, you aren't SRL. this is distinctly different from the increase in THD that comes from increased signal level output, which is as you've described gradual in onset, but always there, even at the tiniest of levels. in contrast, below the max slew rate, there is ZERO SRL.

now, i agree that music is quite dynamic in nature and the requisite slew rate will therefore change throughout the performance, so the effect of SRL may come and go as the program material changes, but that's why you account for a cushion of headroom in your calculations for required SR.

ken

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