Did any of you implemented the CCS 2SK208 Zen Mod upgrade? So implement a -9Volt to the 400uA CCS to give it more headroom than connecting it to ground?
And if so, do you hear any improvements? is it worth it?
And if so, do you hear any improvements? is it worth it?
I have this in test:
In the normal DDDAC design it is always connected to GND.
With the jumper I can switch to GND or to -10V. Current stays almost the same, just a small adjustment to 40mV is needed.
It was advised by Zen Mod to give the JFET more 'headroom' in post 2621, 2568 and 2565 in this thread. There are more posts around that time.
Did someone actually implemented it and hear a big difference?
In the normal DDDAC design it is always connected to GND.
With the jumper I can switch to GND or to -10V. Current stays almost the same, just a small adjustment to 40mV is needed.
It was advised by Zen Mod to give the JFET more 'headroom' in post 2621, 2568 and 2565 in this thread. There are more posts around that time.
Did someone actually implemented it and hear a big difference?
so basically, you are adding a power supply extra into the signal path? I always try to avoid that. extra cost, extra noise, extra everything. not sure if the extra headroom is worth it? Did they describe why more headroom would be beneficial ?
Not sure what ZMs reason was, but the gate capacitance typically decreases with higher drain-source voltage, allowing better high-frequency performance of the CCS. Not sure how relevant that is.
gilding the lily is always logical choice
if for nothing else, then just to be sure that you did best you can think of
if for nothing else, then just to be sure that you did best you can think of