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I should have led with sincerity, without giving the impression of sarcasm. My comment is about why gun control efforts are consistently unsuccessful. I'm a retired teacher. I taught in urban high risk schools as well as boutique private schools. Both communities live with the same fear in the background. But, the production of weapons is "good" for economics. So, guns stick around. I apologize if my comment implied that I'm in support of such a system. I quit my last teaching position--then permanently migrated from the USA--in part because I don't want my own children to grow up with any thought about their school as a non-safe space. I also don't want to teach anyone in an environment where any of us could have a gun. I lost my 401k in the process and I miss teaching, but I don't regret leaving. I hope this clarifies my remark.

I did make X-men round driver which has a similar stax 009/s driver housing but a bit larger，and all X-men headbands actually are made with hifiman's damaged headphone parts, however, the yoke is aluminum 3D printed...😈 for comparison, the one on the right is the same size of 009/007 driver housing , the left one is the X-men with 1.5mm brass holder and #200 steel mesh stator in a 110mm driver housing. the stator can cover diaphragm diameter range from 84~92mm，the currently installed spacer is for 90mm diaphragm. I'm now running into some tolerances and earpad material problems....compared with perfectly matched sgl clone, the round estats have about 1dB consistency difference in sensitivity, and breathable fabric earpad causes roll-off of low frequency. this estat is currently on hold...🙄

Think very fucking carefully before making your 17th post here.

Morricone: Cinema Suites for Violin and Orchestra Marco Serino, Orchestra Haydn di Bolzano e Trento, Andrea Morricone 2022 https://album.link/i/1593642933 Example:

Tried to figure out how to import true New York City bagels... ...from New York City. And no, I am not inebriated. I just miss a proper bagel. I do already know how to import a pastrami sandwich, though.

It started with repairing a badly damaged shangri la jr driver 2 years ago, I almost rebuilt the set from the diaphragm to the stators，and of course the dust cover😦 The first thing I discovered is that the 'nano-technology' used by hifiman actually comes from the covering used by indoors aircraft model enthusiasts，the name is OS film and it is still available on ebay or https://www.indoorffsupply.com/shop/os-film-25ft-roll-1 the driver of the hifiman estats is completely glued which is similar to the early stax lambdas, but hifiman glue is significantly worse...after opening the driver i found that they only use OS film for their dust cover, the diaphragm is another PET film ~ a little bit thicker but with much better strength. In order to repair the diaphragm, I found a seller on Alibaba who can provide samples of Toray PET film with thickness below 2 microns at an acceptable price，and use the inner tire stretcher to stretch the film like any other diy estats ，Then test it with a 10" subwoofer and minidsp umik-1 to find proper F0. conductive coating is another serious problem，I've tried quite a few methods including antistatic agents like licron crystal, ANTISTATIK100，floor cleaner，carbon-based coatings such as graphene, and alcohol-soluble nylon, even tried nano-silver wire solution and metal evaporation...Some of them are sensitive to humidity, some arcs，some are ridiculously expensive, some have uneven surface resistance distribution, and some are sensitive to temperature changes. Yah~ finding the proper conductive coating is the most difficult part especially for a layman. unexpectedly, I tried to search for hifiman patents, hoping to find something useful... here's a patent showing that they used some kind of metal oxide nano particles as conductive coating for their estats. emmm，very interesting...🙄 By consulting with chemistry professionals, I decided to try a solution called ATO (antimony doped tin oxide), there are many antistatic agents I have used before have ATO ingredients though. I got some ATO alcohol solution at concentration around 10~15%, it works really well, and coating appearance is somewhat identical to hifiman diaphragm! The last thing is to repair stators. hifimans probably use #150~300 brass mesh and solder their edges to a 2mm thick aluminum base plate PCB board, then glue the rest of middle part. I've tried tensioning those brass mesh with embroidery frame and manual screen stretcher，but it is not tight enough to stretche brass mesh in this way, the mesh itself is too strong to tighten it up... then I found some brass sieves with different meshes on taobao and these machined copper screens are perfect for making DIY mesh stators... after everything's ready，i desoldered OG brass mesh, cleaned the copper foil, applied low temperature solder paste, and carefully soldered the new brass mesh with a heat gun. During the process of repairing shangri la jr, I started planning to make some bigger mesh stator estats... of course，the target is its big brother shangri la SR😈I received a set of the first batch of shangri la sr made in 2016，here is the headphone inside，yap~inherited the tradition of hifiman with such horrible workmanship...😱 however，SR sounds not as technical as the X9000 though，but with more pleasant and passion. SR uses 3mm thick aluminum base plate PCB instead of 2mm on JR version，2 black things in the middle are to prevent the diaphragm from attaching stators，The D-S gap is around 0.7~0.8mm(thickness of glue included) which is identical to JR version，active area is close to 6400mm² ，that is pretty large diaphragm size for a commercial product though，but less 5300mm² of area on stator allows air to pass through. I tried to use the 3mm FR4 board as mesh holder at first time，however，mesh stator disassembly is not an easy job...therefore，I changed to use 1.5mm brass plates as the mesh holder and glued the copper mesh to it , brass mesh is also replaced with higher # red copper mesh for more convenient adhension. I spent most of time adjusting the tension of the diaphragm and finally found the tension needed for F0 similar to OG SR ,the clone driver has a slightly enlarged diaphragm(6839mm²) ，0.73mm fr-4 pcb spacer， and everything is screwed to the housing cover. The frequency response of clone and SR are generally similar，but the sensitivity difference between the two is about 1.5dB actually，SR is more diffused...clone one sounds a bit more clearer. SR has obvious recession between 1-2kHz，it may be caused by a sealing problem in the space between the driver and the earcup.... It's unlikely to be solved without EQ, but it doesn't sound as bad as it looks from the graphics. one more thing... Every shangri la must have a throne , so I made one for my mutation🤣

I´m playing this with my HP G1... Since I got a 3080 at a "reasonable" price (700€) I´m enjoying all my simulators in VR.

It does, thank you.

You'd probably be more drawn to "Custard's Last Stand" made entirely of flan.

After almost three and a half months, the KGST is finally in operation, and is sounding great. Thanks to all who have responded to my questions and given guidance. I am really surprised at how good the 40 year old headphone sounds with this amp. Special thanks also to Bigir and Dr. Gilmore for such wonder contributions to the community.

Based on your first question you should probably stick with the original design. The 24V zener diode protects the MOSFET from excessive Vgs during power up, when the output capacitor is charged up from zero. Since you recognized the CCS, I probably don’t have to elaborate the benefit of a CCS vs a resistor. The simple answer is yes, you can replace the CCS with a resistor with reduced performance. The 10M90S is in short supply, at least from the US distributors. You can replace it with IXTP01N100D, or based on your rectified DC voltage, try a DN2450 or DN2470. The 1.2k resistor would need to be adjusted to obtain the same current through the zener diode chain as with the 10M90S.

Happy Belated Birthday!

Beautiful work!

Me as well @Kung the X-Men look pretty cool ✌️

Minus the one joke entry, I have done all but two of these.

Happy birthday, Brent!

Live Susanna, David Wallumrød 2021 https://album.link/i/1568506306 Example: An interesting set of classics - make me interested in other albums.

Why do people underestimate the importance of a nice rear view?

I prefer dark chocolate myself, but if I were to make a life sized moose out of chocolate (and who hasn't thought of that?), I would want it to last. So, milk chocolate might make more sense. Of course non of this makes any sense whatsoever.

This is a minor point, but I really love USB audio devices that announce themselves correctly:

Arrived yesterday and it really opens up every electrostatic headphone that I own. I was looking for an amp that can bring more bass out of my HE90 than HEV90 so I drained my pocket to bid on this and now I am very satisfied. The hev90 has a romantic sound but the t2 amplifies every piece of detail, expand the soundstage to what ever possible with extreme fineness and sweetness. Buying any head-fi gear at this price is ridiculous but considering the previous closing bid I think I got a fair deal. And it is so rare to have T2 being sold alone. I do not need another pair of omega so this deal saves me a lot of money. But this amp's functionality in long run is questionable. I hope my handful of obsolete FETs stock will save me some pain when I need to fix this in the future.

Love that warm glow of the tubes.

R.I.P Andrew Fletcher

R.I.P. Ray Liotta at 67...

There will be plenty of demand for DIY repairs; this is what my second set of Shangri La drivers looked like after just over two years. You will be one busy man. The first set had a rattle in the right driver and was replaced, also. Build dates were 2018, 2019, 2022. The last Hifiman warranty replacement took 6 months to arrive. Traded the new set for what I paid for them - a little more than a moldy bread sandwich. At least the Hifiman sandwich comes with a 5 year warranty.