Most excellent Deepak! Should be something new coming to the 'different thread as I'm looking into improving the WES design. By improving I naturally mean throwing most of it away...
Nope, it comes from Sennheiser showing and auditioning a prototype at the international distributor meet last year. That event was meant to show the distributors what R&D were up to.
This is a curse, every time I say "ok, time to sell all this shit I never use" I'm up to the same number again in a couple of months. Hell, I just paid for a SRD-X Pro and a SR-Alpha Pro Excellent and I have no idea why I bid on them...
DIY is much worse. Those Mouser orders really add up...
The DRV134 is a POS and causes far more issues than the slight loss you get with the natural phase splitting in the HV. Just make a RCA-XLR cable with the - grounded.
My HV doesn't run quite that hot, about the same as the standard KGSS. To lazy to wire it up and test though but I did take a lot of care with cooling the amp boards.
The T2DIY is indeed 100% a Stax design on the amp side. Our version is miles better in terms of noise, stability and is actually run at full power (not 50% as Stax did) but the design is 100% theirs. What's in the PSU box is all Kevin's work.
The internal filaments you are referring to are the output tube filaments? They are referenced to the - power rail so a small trace will not cause any hum issues.
The tubes are rated to 1.5A but there is always some variation so I always overspec for at least 10%. I'm using 25VA transformers to drive them in this amp.
Each of the front end tubes draws 300mA at 6.3V so 1.3A would be good for the front end. I highly recommend DC for this role though.
My Megatron boxes just arrived but I'll probably not get to do any construction for a while. Other stuff to finish first...
I got some HD650 capsules as a gift from a certain headphone manufacturer (long story) which I've now turned into a HE60 with some reconditioned parts. Not easy by any means and holy hell they are bright off the B-10 amp. I just love how this amp draws out every small annoying characteristic and just pushes it to the front to really annoy you...