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About mdr30

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  1. Gonna start Dynahi next, on board heatsinks and double mono in two boxes, and wonder if anyone konows where I can source two SJ109 jfets to go with the SK389s I got.
  2. mdr30

    Part Sourcing Assistance/Advice Thread

    Does anyone possibly have a couple of sj109 to complement my sk389s?
  3. mdr30

    Hifiman Jade II

    This is outrageous! I just got a 0,002V shock from my 4xx, an outburst that enhanced dynamics subtly but perceptably. 5th layer stereo depth, black background etc.
  4. mdr30

    Part Sourcing Assistance/Advice Thread

    Anyone got a TKD 2CP 601 stereo pot to spare?
  5. mdr30

    transconductance amp

    Squeezed this amp into a small Modushop case. Tight fit for the caps, but it works. Doesn't get particularly warm. An interesting alternative for planars.
  6. mdr30

    The Multi Amp aka Dynalo Mk2

    Finding and matching them. If anyone got spares, pm me.
  7. mdr30


    As there is one more KGDT being built I thought I'd post some pics. I went with Jose's suggestion regarding the placing of the amp boards, seems to be the best compromise. I had concerns with the AC heater leads but no hum. A modest +/-300V but very nice with normal bias Stax. And 6/12V tube rolling possible.
  8. mdr30

    The Multi Amp aka Dynalo Mk2

    No, but have been tempted. Has its pros and cons.
  9. mdr30

    The Multi Amp aka Dynalo Mk2

    My normal smd Dynalo got purrty hot with 400 ohm bias resistors. Lid on the Economica got almost too hot to touch in a cramped shelf but it worked a couple of years until one of the boards smoked. Replaced components (mostly resistors, some smd:s) and changed to 255 ohm resistors but again smoke - the board had burned through someplace. Thanks to the ever resourceful MLA I got a new board that I populated with the assistance of Spritzer (supplying PZTA06:s). Boy, now it sings. Initially it didn't feel right to play with the volume at 5 but now I prefer it - it's here all amps should operate.
  10. mdr30

    Now for something different...

    Just warmed this up, sounds terrific. Think I'll populate the other two boards for a balanced Squarewave.
  11. mdr30

    Necessity amp [edit: ended up M3]

    Finally got down to assemble this thing, followed Spritzer's suggestion of the M3. Nice making use of the old Noble pot (once doing service in a modified PAS3 in the eighties) and the psu mistakenly bought - 15 bucks - for the Dynalo. Doesn't sound bad at all.
  12. mdr30

    The Headcase Stax thread

    Were there measurements of width and length, more pairs available? Could maybe fit U70.
  13. mdr30


    Thanks all. Gonna be fun finding one of n:th solutions.
  14. mdr30


    Any suggestions on how to best place the power supply and amp boards before I start drilling? Transformer's place is given, and maybe the power supply should be placed at the back too with the amp boards facing the front (right). Thinking of hum and heat issues. Tubes will fit inside the box but I suspect holes on top lid above the tubes would be beneficial - top lid only has those small ventilations on the sides. Depends how hot the KGDT runs.
  15. mdr30

    The Headcase Stax thread

    Thanks. Let's see if I get them running with an adapter.