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kevin gilmore

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kevin gilmore last won the day on April 26 2017

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About kevin gilmore

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    Staximus Maximus, Stax Mafia's Chief Cook and Bottle Washer

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  1. kevin gilmore

    Stax SRM-T8000

    guess you did not look at the schematics. i'm talking about the current sources at the top of the gain stage before the output stage. main difference between 717 and 727 was 2sa1968 current sources (and local vs global feedback) srm353, T8000,D50 are back to being all resistors. and the german copy of the srm323 also uses resistors because of the 400v power supplies.
  2. kevin gilmore

    Stax SRM-T8000

    The 323 had a p-channel jfet as the input, +/-350v power supplies, 2sa1968 as the current source for the drivers etc. The 353 is a srm717 with all of the extra transistors removed. Very similar to kgss. D50 is identical to 353 running at slightly lower power and lower voltage. Current source is resistors on both. T8000 also uses resistors for the current source. seems that stax has run out of 2sa1968. d10 uses apex opamps with a power supply of +/-175, not great for large voltage swings. stax may be forced into using parts in the future that it does not want to use for some reason.
  3. kevin gilmore

    Now for something different...

    probably not worth making a balanced version, the output impedance is not super low.
  4. kevin gilmore

    unbalanced/balanced to balanced tube input

  5. kevin gilmore

    krell ksa5 klone

    Mikhail rebuilt an original with black gates. Probably not possible these days. A few were the wrong voltage.
  6. kevin gilmore

    stax t8000 clone (well sorta)

    in theory with appropriate adapters or the right circuit board layout it would work. Lots more filament power. Lots more heat.
  7. kevin gilmore

    stax t8000 clone (well sorta)

    Yep that is the idea
  8. kevin gilmore

    stax t8000 clone (well sorta)

    should be possible to put the input tubes in the middle of the board, then left and right versions of the board will not be necessary
  9. kevin gilmore

    HC Bike/Cycling Thread

    i'm think there is something wrong with the frame. you can keep putting bearings in, but they will continue to die.
  10. kevin gilmore

    The Headcase Stax thread

    at 1kv, into cold tubes when the turn on delay is not working, yep lots of plasma that said, the T2 (both of them) can eat input tubes real easily especially when you put fake siemens tubes in there
  11. kevin gilmore

    The Multi Amp aka Dynalo Mk2

    switching half the lines is not the main problem. the main problem is that dc on the input with an unbalanced input will generate differential dc on the output which the epsilon 12 will not detect.
  12. kevin gilmore

    The ultimate DIY? A Stax SRM-T2!

    I made them as gerber version 2, that is what everyone seems to want to use these days. no idea which polygon or layer... here it is as rs274x staxt2powershrunk - CADCAM.ZIP
  13. kevin gilmore

    The Headcase Stax thread

    measure the bias wire from stax jack to stax jack. Had better be 10 meg (5M x 2). Anything else and the thing is not good for the headphones.
  14. kevin gilmore

    The Headcase Stax thread

    Justin and birgir sell stax sockets.
  15. kevin gilmore

    stax t8000 clone (well sorta)

    On the t2 and diyt2 the front end tube filaments are referenced to ground with resistors