The saga continues. As I mentioned above, I’ve been playing with interconnects. They are in general, very low capacitance (about 15pF per foot).
The one lagging item has been the shielded IC between the step-up transformer and the input to the Herron. Getting this architecture "right" has been a bit of a challenge.
Over the weekend, I came up with two configurations. 95% of the "hashy overshoot" reported (running into the step-ups) is gone. This was clearly a resonance interaction between the inductance of the transformers and the capacitance of the interconnects.
I’m now back to running the step-ups. To my ears, there's more dynamic subtlety ("bloom") with no down side, but as usual, YMMV.
At the end of the day however, the Herron’s MC gain stage is very good, and while you can start with it, exploring step-up trannies might ultimately suit your tastes and your system better.
The Herron sets a very high baseline, and presents a good platform for experimentation as well.
Cheers,
Thom @ Galibier Design
The one lagging item has been the shielded IC between the step-up transformer and the input to the Herron. Getting this architecture "right" has been a bit of a challenge.
Over the weekend, I came up with two configurations. 95% of the "hashy overshoot" reported (running into the step-ups) is gone. This was clearly a resonance interaction between the inductance of the transformers and the capacitance of the interconnects.
I’m now back to running the step-ups. To my ears, there's more dynamic subtlety ("bloom") with no down side, but as usual, YMMV.
At the end of the day however, the Herron’s MC gain stage is very good, and while you can start with it, exploring step-up trannies might ultimately suit your tastes and your system better.
The Herron sets a very high baseline, and presents a good platform for experimentation as well.
Cheers,
Thom @ Galibier Design