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  1. Knijsterbek

    The Stax thread (New)

    Quote: Apart from the common balanced vs unbalanced discussion (better noise shielding, etc.):   If the source is a true balanced design, signal/sound quality could profit from it because 2 conversions are cut out (balanced to unbalanced and unbalanced to balanced) as all Stax amps...
  2. Knijsterbek

    The Stax thread (New)

    Quote: SRM-T1 can also be converted to balanced inputs. The circuit board layout is prepared for it.
  3. Knijsterbek

    The Stax thread (New)

    Quote: Consider a SRM-T1 as well. On normal bias lambda's it beats my SRM-1/Mk2 (p.p.) by a fair margin. Same comment as on the SRM-1/Mk2: replace old caps. Extra bonus: SRM-T1 can be converted to take ECC99 tubes (like SRM-600 Limited). Should be even more beatiful...  
  4. Knijsterbek

    The Stax thread (New)

    Quote:   Balance + offset adjustment: With 1 tube per channel, adjustment of the balance between the tube sections is needed. The measurements can be made on the outside of the amp in the Stax socket between the + and - lead of the channel (L or R). Adjust for 0V DC. This can be hard...
  5. Knijsterbek

    The Stax thread (New)

    This is all I got. It was once posted by Spritzer, so we would have to thank him.... If you save the jpeg and open it in a viewer it is a rather large file and easy to read.   The previous transformer wiring pic is from a valve amp (6.3V heater supply secundairy). Bottom line: primary...
  6. Knijsterbek

    The Stax thread (New)

    Quote: In mine, which is wired for 240V, with AC mains of 230V, I measure 39V between the red secundairies and 480V between the yellow secundaries. So red would be step down and yellow would be step up.   Here is the schematic whee you can also see the details of the transformer...
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    [No title]

    srm-1_mk2_Schematic.jpg
  8. Knijsterbek

    The Stax thread (New)

    Quote: Wiring is correct. The back panel was meant for the versions that were shipped with a plug to change the mains voltage in a more comfortable way... . If you don't use the plug, you don't need the back panel. But: be carefull and convince yourself that the connections you...
  9. Knijsterbek

    The Stax thread (New)

    Mine is C4245 and has all the wires. Re-bias is always a good idea. Adjust balance and offset for 0V DC. Repeat measurements a few times. Remember that the power supply is not regulated, so your measurements will change as mains voltage changes. Also, the bias fluctuates heavy with the...
  10. Knijsterbek

    The Stax thread (New)

    Quote: This is what I found on the net:   Here is the correct wiring: 100v: Gray+White White wire from the  ACplug+Brown+Green 117v: Gray+White White wire from the AC plug+Blue+Purple 240v: Blue+White wire from the AC plug Purple+Gray Should work for all Stax amps. ...
  11. [No title]

    [No title]

    staxpower2.jpg
  12. Knijsterbek

    The Stax thread (New)

    Quote: I consider mains supply as very important as it all starts with electrons coming "out of the wall" (unless battery powered...). For my main system: - Dedicated audio group with audio grade fuse - Shielded mains cable between the "fuse box" and the the wall outlet - Isolator...
  13. Knijsterbek

    The Stax thread (New)

    Quote: Thanks. I will keep listening for noise.     Quote:   Although I don't have a KGSS to compare and I cannot switch back to the unmodded 727, I did experience quite an improvement in sound quality after the mod. Much more control. Especially in the bass/upper bass this...
  14. Knijsterbek

    The Stax thread (New)

      Quote: With 1 tube per channel, adjustment of the balance between the tube sections is needed. With 2 tubes per channel, adjustment of the balance between the tubes is needed (sections are paralleled). The measurements can be made on the outside of the amp in the Stax socket between...
  15. Knijsterbek

    The Stax thread (New)

    I performed the "Spritzer mod", which consists of the re-location of 2 150K resistors in the feedback loops per channel, plus changing the values of 2 resistors per channel to fix the low gain issue. For the re-location of the 2 resistors in the feedback loops, the originals have to be...
  16. [No title]

    [No title]

    Stax SRM-727II plug in board
  17. Knijsterbek

    The Stax thread (New)

    Hello to all, I'm fairly new to this forum and untill now I have read a lot of posts to get a bit acquainted. For normal bias phones, I use a SRM-1/Mk2 which I would like to upgrade (actualy a P.P., but I fitted 1 normal bias socket). I have read about swapping out the power transistors...
  18. Knijsterbek

    FS : Stax SRM-1 Mk2 P.P. rev.C , SRM-3 , Lambda Nova Classic , KOSS ESP/950

    Hi,   You got a PM on the SRM-1 Mk2 p.p.   Kind regards,   Paul
  19. [No title]

    [No title]

    _39P1671.jpg
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