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About Laowei

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

Profile Information

  • Gender


  • 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 Model 19 speakers. ALTEC 809C Bolero speakers modified with vintage Great Heil AMT

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  1. The Headcase Stax thread

    Moar bass.
  2. Cavalli Audio Liquid Carbon

    The fake goes deep on Taobao.
  3. Cavalli Audio Liquid Carbon

    Shit, there’s even a faked Kerry built T2!
  4. The ultimate DIY? A Stax SRM-T2!

    More tube weirdness. The JJ 6CA7 is a Beam Pentode, with the beam forming plates connected to pin 1, similar electrically to the pentode EL34’s G3. The other big bottle 6CA7s are Beam Tetrodes, with the beam forming plates internally wired to the cathode (pin 8). Pin 1 is NC in this case. In the GG, G3 is tied to the cathode on the PCB. So no difference electrically between using any EL34 or 6CA7 in that position. In the T2 circuit, G3 is tied to the plate and draws current, so may have stressed the JJ 6CA7 beyond what it could handle. The internally connected EH 6CA7 doesn’t see that.
  5. The ultimate DIY? A Stax SRM-T2!

    Indeed, congrats on the fantastic build Whitigir! You’ve really been on the STAX DIY fast lane this year. Enjoyed following your journey.
  6. Part Sourcing Assistance/Advice Thread

    On a hopeful note, maybe the measured values are accurate with matched sections and are useable.
  7. Part Sourcing Assistance/Advice Thread

    Similar text bleed and errors on both. The silkscreens look like they were made from a second or third generation photocopy. My guess is they are relabeled and fake.
  8. grounded grid

    The graphic is from earlier in this thread where the PCB was first posted. It matches the traces on my PCB. Both appear similar and no printed Revision level is found. I bought my boards from another member, so probably the first. Kevin quickly drew up the GG (a tube version of the Carbon) to humor us vacuum tube Luddites. Your example looks like a later version. Basically the same, just tidied up a bit. The amazing thing is, even the quickie electrostatic amp designs that Kevin publishes, are simply incredible sounding. He is an irreplaceable source of inspiration for us DIYers.
  9. grounded grid

    Another couple of questions on grid connections in the output sections’ triode wired EL34s in the GG. 1) Per the GG PCB, and also the KGBH schematic, G3 (the suppressor grid) is tied directly to the cathode.This is the conventional connection for a grounded cathode circuit. In a grounded grid circuit where the cathode is driven, wouldn’t the added G3 parasitic load be harder/non-linear to drive? 2) In the DIY T2 and T8000 Sandwich PCBs, G3 is directly connected to the Plate. circuit. Is the suppressor function really needed in a grounded grid triode? Seems like driving the cathode only would be optimum in a grounded grid circuit. 3) Does the STAX T2, or DIY T2 have a history of being harder on the output EL34s’ G3, than a KGBH? I searched and could not find any mention of this. 4) Any advantage to cutting and modifying the traces on my GG PCB to try out the G3 to Plate connection? Thanks for any advise offered. T8000 Sandwich: GG:
  10. Schiit Yggdrasil

    Not in my experience. I hear a clear improvement between the Gen 5 and Gen 3 in my Yggy. Lots of others have reported the same.. The Eitr I first bought to try out crapped out on me, and I returned it. Their QC sucks. Have you contacted Schiit and complained? You may have gotten a sour unit too.
  11. Schiit Yggdrasil

    How does the Gen 5 compare to the previous USB input?
  12. Schiit Yggdrasil

    The Gen 5 USB does a lot better job than the stock Yggy Gen 3. For $100, I think you will be suprised and happy with the SQ after swapping them out. Do you have a lot of DSD content stored? Have you tried converting to hi-res PCM on the fly from your computer?
  13. Schiit Yggdrasil

    Much of a problem getting the LEDs on the main PCB lined up with the front holes on cover?