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Hi Andy

Let's just say that some of the discussions from DIYAudio a few years ago regarding cascodes paid some dividends in this case. It started me thinking in some new directions regarding the front-end circuitry. Thanks for your input back then.

I also got some inspiration from peufeu's analysis of the Lavardin "memory distortion" phenomenon. That ultimately turned out to be a dead-end (for me at least), but it opened a few new doors.

On-Semi's ThermalTrak output devices are something that the audio community has been waiting decades for (and, no, I don't like the Sankens with built-in bias diodes because they have the wrong internal topology). It took a *lot* of fiddling to get them to work right (nothing's ever as easy as it seems), but in the end they also provided a nice improvement.

But perhaps the biggest single thing was that I had the luxury of fiddling with them for four months before releasing them to production. Just playing around with different component values and fine-tuning the circuit by ear brought the performance up to an entirely new level. I spent hundreds of hours listening and tweaking, listening and tweaking, listening and tweaking.

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  Kimber Kable  

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