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Laowei

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Laowei last won the day on April 3 2018

Laowei had the most liked content!

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About Laowei

  • Rank
    Limited Edition Bronze Participant
  • Birthday 06/07/1957

Profile Information

  • Gender
    Male

Converted

  • Headphones
    Stax SR-009, SR-207, SR-003mk2
  • Headphone Amps
    KGHV-Grounded Grid
  • Sources
    Mac mini > Schiit Yggdrasil
  • Other Audio Gear
    DIY PP 6V6 amplifier. ALTEC 890C Bolero/Econowave modded speakers

Recent Profile Visitors

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  1. Laowei

    stax t8000 clone (well sorta)

    Keeping paperwork updated can be a major PITA. Especially projects strung between separate people. Thanks for clearing it up, and making your mini T2 available to us DIYers, Joachim!
  2. Laowei

    stax t8000 clone (well sorta)

    On a quick look over, the Schematic mini T2 (1).PDF linked does not match the schematic Joachim posted above. In particular, the one linked shows an additional -400VDC supply is requried, That -400VDC supply isn’t needed per Joachim’s latest posts and schematic. Wondering which version of the schematic applies to the PCBs?
  3. Laowei

    current feedback electrostatic amp

    Thanks Jose!
  4. Laowei

    current feedback electrostatic amp

    What are the board dimensions?
  5. Laowei

    current feedback electrostatic amp

    Do the 2K trimmers also help in adjusting/minimizing output balance?
  6. Laowei

    Technical Assistance/Advice Thread

    My biggest concern hand tapping was snapping off in the hole due to angular misalignment. That should not happen with the Shars tool. 👍 I think you will like it when you use it. It works very well for what it was intended for. Thx to Kerry for sharing.
  7. Laowei

    Technical Assistance/Advice Thread

    This is one way to do it. Position the PCBs in the pattern/spacing you want on graph paper. Transfer draw holes to be drilled aligned on the graph grid. Add centerline of pattern to grid. Then cut down paper and use centerline and grid to position on heat sink and tape it down securely. Then locate PCBs on graph grid drawn holes and tape down. Use centerpunch in PCB holes to dimple heat sink to prevent drill wandering. I leave the grid paper and PCB there to act as a visual template when drilling. I use a cheap Harbor Freight desktop drill press to get the tap drill holes drilled perpendicular to the heat sink face. For M3x0.5 threads I use a 3/32 (.094) inch tap drill size. I preset the stops for a drill depth to around 6-7mm, as to not break out the other side of the heat sink. And then drill all the holes. Pull the PCBs and graph paper off and deburr the drilled holes so that the rough edges are flush with the heat sink surface. Then mount a M3x 0.5 bottoming tap in the Shars tap holder (the T handle shaped piece). Slip it into the Shars alignment stand (this holds the T handle piece perpendicular to the surface), and then using a little light lubricant, carefully hand tap each hole drilled. After each full turn of the tap, back turn 1/4 turn to cut off the internal chip. Repeat until you can remove the tap and easily screw in the length of the machine screw used for assembly. FYI, I cleaned the cheap shipping lube off the sliding parts of the tap holder because it was squeaking badly when used. Replaced with a little Never Seize and now it spins without a peep.
  8. Laowei

    Technical Assistance/Advice Thread

    Recieved my Shars Tap Holder this afternoon. Put it to use on a CF electrostatic amp I have been putting off working on because I dreaded tapping threaded holes by hand. It really works slick and the results came out great. Thanks for posting this Kerry. Nothing beats the right tool for the job.
  9. Laowei

    current feedback electrostatic amp

    Inspiring work, JoMat! Did you do any matching on the transisters?
  10. Laowei

    Megatron Electrostatic Headphone Amplifier

    Nice build!
  11. Laowei

    The Knuckledragger 3rd Memorial Slow Forum Post

    “I’d like this made into Raccoon McNuggets. Sure, I can wait.” https://www.sacbee.com/news/state/california/article224206910.html
  12. Laowei

    KGSSHV Carbon Build Thread

    For each channel. from the amp’s input female RCA panel jack, connect the center positive signal to “I +” on the KGSSHV Carbon PCB’s screw terminal block, and “I -“ connected to GND. The Carbon’s differential input circuit will do the rest. As Helium noted, there will be less volume available. Around 6dB loss of sensitivity. Shouldn’t matter at all.
  13. Laowei

    The Headcase Stax thread

    Spot on. Woo just notified they will be in stock in the US in 2 weeks. Cost: $70 shipped. Wish they would release the .stl files so could just 3D print ‘em, instead of being Jack’ed around.....
  14. Laowei

    The Headcase Stax thread

    Where did that number come from?
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