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Posts posted by gustavo.skn

  1. It will take some time for this to happen but in general I wouldn't recommend connecting headphones to them as they are essentially broken.  What's wrong is they use the wrong ballast resistors for the bias supply or, as I've seen twice, just don't use any.  This will burn off the coating and fuck up the diaphragm. 

    Well this scared me a bit. Seems that Woo is not a good option in terms of reliability. 

  2. I'm trying to find out if my 007MkI is the early or late version. Its S/N is 71194 but it has the faux carbon box. Is there any other differences? That Stax paper that comes with it says "Printed in Japan 98-10-1K MA", don't know if this helps anything. I have read that the arc and headband changed, but wasn't able to see any differences in the photos I found in internet.

  3. I'm currently buying the componentes for the kgsshv using the BOM by ujamerstand, but I have a problem:

    2SC2705 4 Toshiba Mouser 757-2SC2705-O(TE6,F

    2SC1815 2 Toshiba Mouser 2SC1815GRTE2FT

    Bridge 1 STM Electronics mouser 512-KBU4M

    2n3904 4 On Semiconductor mouser 863-2N3904G

    These parts are listed as obsolete in mouser. I could find a replacement for the 2n3904 with the same specs (2n4401) , but got no luck with the other ones... Anyone have these and want to sell me? Or can help me finding a replacement that is ok?

    Thanks guys

  4. No discredit towards Lil Knight, but this BOM thanks to ujamerstand is my preference. grin.gif

    It brightens my day to hear that. Cheers guys. smile.png

    That BOM is for the offboard sink version mainly though, so people building the onboard sink will need to modify it to suit.

    Thanks guys for this, It's going to be really helpful!

  5. yes

    Thanks livewire

    4M7 or 5M, it doesn't matter but do use one which is rated for 600V.

    I was using the Lil Knight BOM and the 4.7M listed is the 293-4.7M-RC (xicon) which is rated only 350v...

    The KOA Speer, although listed as 700v voltage rating at mouser, if you look at the data sheet, the absolute maximum working voltage is only 350v too.

    The best I could get was the CMF-60 from Vishay/Dale, absolute maximum working voltage of 500v. Do you have any model that is rated at 600v spritzer? Looked at mouser and couldn't find any that kept the 50ppm/C and 1/2watt power rating


  6. I did some research on parts that I need to buy since there are tons of BOMs, and looking at the schematics and the jpg and found that the resistor before the Pro Bias in pdf uses 5M and in jpg 4.7M... Which one is the right one? Or this don't make any difference? Should I trust more in the pdf schematic or the jpg?

    JPG: http://gilmore.chem.northwestern.edu/kgsshvps8e.jpg

    PDF: http://gilmore.chem.northwestern.edu/kgsshvps8e.pdf

    I'm going to build IXYS since A1968 is unobtainable nowadays... using IXYS, If I'm using a 450v supply, R6 and R16 stay as 20k right? The resistance on these is dependent only of the supply and not if it's ixys or a1968, is it correct?

    Thanks for your help

  7. Thanks guys,

    I'm quite lucky since an user from a brazilian forum sent me a pm willing to sell me his pcb from Lil Knight board run, offboard version rev0.6 - so probably no trace error? I got the FCE from johnwmclean, who was very kind to share it with me. Things are going well, let's hope it continue like this until the end!

  8. I'm too tired to make any sense now but I believe the stock configuration runs at 6mA so it's a significant jump in current draw.

    There isn't another board run planned but the Gerber files have been posted in the thread and it's easy to just drop any fabhouse and email for a quote. Just ask how much a pair of amp boards and a PSU board would run you. Larger yields are cheaper though.

    Thanks spritzer, will send the Gerber to some fabhouses to see how much it would be! Hope that they make small quantities of the board...

    Can someone confirm if this are the last gerber avaliable?



    I need two of the kgsshvampv7s and one of the kgsshvps8e right? Is it better to use onboard heatsink or pesante?


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