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About mwl168

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  1. mwl168


    Cannot tell from the pic which terminal is for what, but maybe keep the tranny and PSU where they are and orient the amp boards and place the input XLRs so the signal wires are as far away from the tranny as possible.
  2. mwl168

    The Headcase Stax thread

    Limited to 180 sets worldwide...
  3. mwl168

    CFA3 balanced amp

  4. mwl168


    Maybe Tyll will come out of retirement and do a review and compare it with the Focal Utopia.
  5. mwl168

    2018 PCB Group Buy with TKD pots

    I have spare BH, GRHV and GRLV boards. PM me if you are interested.
  6. mwl168

    stax t8000 clone (well sorta)

    Can KSA1156 be used in place of the 2SA1486 here?
  7. mwl168

    current feedback electrostatic amp

    Kevin has noted that KSC5026 is a substitute for KSC2752. Last I checked it was BO at Mouser but in stock at Digikey!
  8. mwl168

    What Are You Building Today

    What's the amp on the left side of the Limited?
  9. mwl168

    The ultimate DIY? A Stax SRM-T2!

    Or you can build the relay-based, full-balanced, true ladder attenuator that Kevin designed and there was a board-run for it a few months ago so there may still be PCBs available for it.
  10. mwl168

    current feedback electrostatic amp

    I compared the resistors to my board and, without seeing the trace, they look right. This amp runs much hotter than I expected so make sure you have ample heatsink. The 500K bias resistors set the output current.
  11. mwl168

    CCS mod for 006t (t1 Variant )

    @ vvega: check Craig Sawyer's Dec. 16, 2010 post on the KGSSHV thread. His rationale why a thin insulation pad, no matter the voltage rating, would result in arcing in high voltage application makes perfect sense to me.
  12. mwl168

    Megatron Electrostatic Headphone Amplifier

    My bad. I gave Jose bad information. The drop resistor is R19 which is marked 21K on the PCB. I got those two numbers mixed up...
  13. mwl168

    Megatron Electrostatic Headphone Amplifier

    Yes, and, as JimL stated, may also want to increase R12 to maintain (R11 + R12) close to 13.3K to maintain the gain and bandwidth as originally designed . EDIT: attached Megatron schema for reference. megatron.PDF
  14. mwl168

    Megatron Electrostatic Headphone Amplifier

    Jose's mod sets the CCS at 1mA instead of .85mA. This is likely the reason why the 12X7 plate voltage is quite a bit higher than the 245VDC I am seeing on my amp.
  15. mwl168

    Megatron Electrostatic Headphone Amplifier

    It may worth mentioning that, based on the plate characteristic chart of the 12AX7, this higher plate current also puts the tube in the more linear operation zone. Whether the effect is audible is debatable as always.