Fang is supposed to have said it will be similar to the Orpheus II.... If so he has completely lost his marbles. Nothing they make is worth the asking price now based on the sound and the build quality, let alone something like this.
Full voltage swing with a high enough input signal from most of these amps will burn the diaphragm. An amplitude twice the bias voltage or higher on either stator would be very bad indeed.
Hard to say when the phones will be damaged but let's not play them with the DC rails floating on the stators. Anything short of that and they should be fine.
Stax says the amps should be below 20V when warmed up but I think it is far too conservative.
Doesn't matter if they are there or not. The amp certainly doesn't care.
The nut isn't a problem when attached to a PCB. The issue is is the pressure of the pin as they grip too much. They need to be opened up to the correct pressure
This will form the basis of the new Blue Hawaii I'll build next year. Good thing here is that tube failure is far less catastrophic plus it should sound better.
That's pretty much it. Most of the SRD-7 units used a transformer to further step up the audio signal and isolate the bias supply from the audio signal.
They are much closer on the newer boards as in they are touching. For a normal KGSSHV there is no need for heatsinks on the LV stuff. Doesn't generate enough heat for it.