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bui501

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About bui501

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    Male
  • Location
    Bangkok, Thailand
  • Interests
    Music, Machine Shop

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  1. bui501

    KGSSHV Carbon Build Thread

    Thanks, guys. Blueman2, the custom electrostatic drivers are indeed my creation -- they were inspired by Chinsettawong in his DIY Electrostatic Headphones forum on Head-fi.org (https://www.head-fi.org/threads/my-diy-electrostatic-headphones.498292/), and they were the reason why I started building electrostatic amps in the first place. When I saw that thread several years ago, I bought an old stax SRM-1/Mk2 from eBay to start my DIY headphone attempt, wasn't happy with the old stax amp, so built the KGSSHV... It's been an ongoing fall down the rabbit hole since then. The drivers were made from pcb boards and mylar film with a coating of staticide 6500 antistatic spray on the film. I'm waiting to get access to a machine shop or at least a cnc router again so I can build the cups for them -- or at least get some time again to finish up the wood cups that chinsettawong gave me so I can finally case some of my drivers. In the meantime, though, I have some acrylic headphone cups I've just finished cutting that will finally serve as my version 1.0 of the DIY headphones. (will post pics soon) I know most of you guys have the top-of-the-line Stax headphones and look down on the SR-404 and 300 series, but that's all I have, and these DIY drivers blow those old Stax headphones away in both transparency and soundstage. JoaMat, the relay board is just a stock selector board to let me switch between the balanced (tiny XLR) and unbalanced (phono) input. That and the SumR transformer are the only major components that's stock -- I made everything else from scratch including the stax connectors, pot board, etc. The stax connectors were made from stocks of teflon and have gold-plated brass vacuum tube sockets for connectors. I even molded the stax connector on the cable from scratch: the flat cable itself was a Koss extension cable; the connector on the end was made from pieces of brass rods, a teflon core I milled on a table-top cnc, and covered in a cast hard urethane casing. I DIY cast the mold out of silicon from the end of the cable on my SR-404.
  2. bui501

    KGSSHV Carbon Build Thread

    I finally broke down and put my "temporary" acrylic front plate on my carbon build... I finished the boards almost 9 months ago and have been waiting for access to a cnc or mill to make the front and back plates. After waiting for so long, I finally bolted the acrylic plates that I had originally made just to size and verify the positions of the components... The amp sounds pretty darn awesome, even with the uncased DIY drivers I had made... Loud enough at 12 O'Clock position to fill a small room with very transparent, noise-free music... Definitely enough to blow out what's left of my eardrums. It'll probably be a while before I can get the permanent, aluminum front and back panels made.
  3. bui501

    The ultimate DIY? A Stax SRM-T2!

    I sent the staxt2powershrunk gerbers to a board house for a run, and they ran into the following error. Should I be using the netlisted version that Kevin posted?
  4. bui501

    The ultimate DIY? A Stax SRM-T2!

    Thank you, Kevin and JoaMat.
  5. bui501

    The ultimate DIY? A Stax SRM-T2!

    Kevin, I have the original t2hvandlvpsukgsshv2 board you posted a few years back... do I just need one of those boards for the T2 or 2 of them? I noticed the new power supply board you posted yesterday is significantly different from the t2hvandlvpsukgsshv2 combination power supply.
  6. bui501

    The ultimate DIY? A Stax SRM-T2!

    Now I know who the hoarders are -- and why they're so expensive from reputable vendors -- GRRRR
  7. bui501

    The ultimate DIY? A Stax SRM-T2!

    Thanks. I'm planning to after my experience with the counterfeit CREE parts from alibaba during my Carbon build. I've purchased the DY294 transistor tester that was recommended a few years back in this thread. Is there are better/more accurate equivalent that you're using? My DY294 sometimes gives me a bad reading for a known good part from mouser. I would purchase a curve tracer for this project, but they all seem to be prohibitively expensive compared to all other lab equipment. -Vinh
  8. bui501

    The ultimate DIY? A Stax SRM-T2!

    Awe, Nuts! :-D Thank you, JoaMat & Spritzer. I’ll look them up on mouser. This is the very last sand I need to source from the T2 BOM... assuming none of the older items are not fake (knock on wood).
  9. bui501

    The ultimate DIY? A Stax SRM-T2!

    JoaMat, would either of these two part be suitable as a substitute for stn9360 on your shrunken board? (Stn9360 is currently out of stock at all the major components vendors until 2019.) PBHV9560ZX can handle up to 500mA but has higher capacitance; PBHV3160ZX has input/output capacitance closer to that of STN9360 but can only handle up to 100mA. Both are 600V devices like the STN9360. Datasheets attached. Even the more recent sands are starting to be difficult to source. PBHV9560Z-465958.pdf PBHV3160Z-466472.pdf
  10. bui501

    The ultimate DIY? A Stax SRM-T2!

    Thanks, Kevin. Was hoping I had stumbled on a cheap drop-in replacement. :-(
  11. bui501

    The ultimate DIY? A Stax SRM-T2!

    Would Sanyo 2SK2160 be a suitable substitute for the 2SK216? It looks more readily available. (Data sheet is attached.) 2SK2160.pdf
  12. bui501

    The ultimate DIY? A Stax SRM-T2!

    Found it!!—(The missing trace in the original shrunk board). Thank you, George. Looks like Kevin fixed it in shrunkedv2. Problem with reading this thread all the way thru at once is that everything is running together. Either that or I’m just getting old.
  13. bui501

    The ultimate DIY? A Stax SRM-T2!

    Thanks for the warning. I'll stay away from those boards. I've been looking at the gerber files for the shrunkv2 board and the shrinkedv10 board with the thought of either making my own from the gerbers or sending it off for a small batch run. Thanks, George -- 1/2" doesn't seem like much, but it's a big savings in case work that I'd rather just put toward the electronics, which is why I was looking at the shrunk version and JoaMat's shrinked10 version of the boards. Do you happen to know if the board errors were just in the particular run of boards that Lil Knight did back then or if they were inherent in the gerber files? I was planning to either etch my own board (ala JoaMat style) or do a small batch run with some pcb prototyping service.
  14. bui501

    The ultimate DIY? A Stax SRM-T2!

    Awesome! Thanks so much for the clarification on the smd transistor and the advice re. the ksa1229a/ksc2690c. (I had kind of guessed it was your name along with Kevin's on the shrunkedv10 board, but wasn't sure -- sorry, I'm a bit dense on these things. )
  15. bui501

    The ultimate DIY? A Stax SRM-T2!

    Thanks, JoaMat. The stn9360’s are what still puzzles me—when i searched for STN9360, this part (data sheet below) is the only one that shows up... Is this the same transistor that you used just in a vertical form factor back then?
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