Will the AVC have a red circuit board like the rest of the modules? All the current pics show a green board. Also, If I get an AVC now, when you develop the AVC/Tube combo down the road, will I be able to add the tube stage to it down the road?
Eventually, we should have red PCBs for the AVC. The upper PCBs for the AVC were already green from Bent Audio (John Chapman was selling them as Slagleformers before we started using them in LIO), so we have been using them and John did the lower board PCB layout to make them work with LIO and he used green to match. I do want to migrate to all red, but it might not happen until the upcoming AVC/Tube module (below):
If you buy the AVC module now, and later want the AVC/Tube module down the road, I DO intend to offer an upgrade program of some sort for all LIO customers.
You would pay the difference + shipping. It will be very easy to upgrade. Details will be available in time...
Yes, the AVC is more transparent overall than the RVC + Tubestage.
Given this info, it really makes very little sense to add a tube buffer after an AVC.
For those who love the RVC + Tubestage, the combo AVC / Tubestage board that we hope to offer later will be be a
"step-up" (no pun intended) in performance. I will explain more about it and how it compares to all the other
options that we currently offer when I at least have a working prototype board (everything on one board and when we
confirm that we can get it all to fit - but I'm confident that it will happen). More on that later...
Adding a buffer after the AVC is really unnecessary inless you want more electronics in the signal path or need a little bit of voltage gain that a buffer can provide, beyond the little bit the AVC provides in its upper last few volume steps.
Just to avoid confusion...
The LIO Tubestage after the AVC would add current
gain (not voltage gain, as the LIO Tubestage is unity voltage gain).
But compared to the RVC + Tubestage, the LIO AVC actually offers voltage gain (at max volume, it is +7dB) and the RVC does not (at max volume, it is 0dB = unity gain).
Looks like brh beat me to it and answered all your questions (thanks!)