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GeorgeP

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Everything posted by GeorgeP

  1. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Ooof - then it sounds like you have some work ahead of you...
  2. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    So you only have one properly working side then?
  3. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Sounds like current limiting in the power supply if only one side is powered up at a time and it powers up normally - 30r resistor to 25r or 20r will fix that. What happened though to cause you to start replacing parts in the amp section first - there may be something else afoot?
  4. GeorgeP

    Hifiman Jade II

    I don't think so. He actually has a picture of a train and a picture of a bicycle side-by-side, and then goes on to state that they are not the same thing. I found that illustration particularly compelling. Though I think he might have had the arrows from the amplifiers pointing the wrong way...
  5. GeorgeP

    Hifiman Jade II

    Only thing I learned from Fang's latest post is that a bicycle is not a train...
  6. GeorgeP

    Blue Hawaii Special Edition

    Russian Mullards? Maybe you messed up the balance/offset process.
  7. GeorgeP

    Blue Hawaii Special Edition

    Sounds like your tubes are the issue. If your tubes are within spec, you probably shouldn't have had to rebias at all. What were they measuring at before you rebiased?
  8. GeorgeP

    Hifiman Jade II

    Well one thing in the earshock guy's favour is that Hifiman wasn't able to get him to be one of their shills - that's got to be worth something.
  9. GeorgeP

    Hifiman Jade II

    But smoke and mirrors work wonderfully on their audience.
  10. GeorgeP

    Hifiman Jade II

    It is just a link to a tutorial on caps : https://www.electronics-tutorials.ws/capacitor/cap_7.html (so you can better edumacate yourself, of course...), and the following Pf calculation: MOSFET C1=65 Pf Transistor C2=6 PfCtotal=C1*C2/(C1+C2)Ctotal=5.49 Pf
  11. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    The Board error is an easy fix - a missing trace if I recall. There are some posts on it in this thread. I seem to recall G600 had this issue. Why not post some pics of the sand (2sk216, 2sj79, 2sc3675 and 2sa1486) - sometimes it is easy to tell from a visual.
  12. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Have a couple of these I've been meaning to get to. Wish I got in on the parts group buy as I just can't get motivated now.
  13. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    yeah but the rk50 is all gold-like and purdy lookn.
  14. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    First, it would be hard to prove (and to what end, now, 4 years later). Second, you would not have known, so you shouldn't have any guilt on your part. I corresponded with him back in 2015 about the Lil Knight T2 boards he was selling and he indicated that "Last time I heard from him was 8-9 months. At that time, he was in hospital, probably in a coma. He was a big help to me back then, not sure what happening until now." Maybe it is true. If so, prior to going into a coma Lil Knight gave this guy all his partially completed amp builds, audio parts, T2 boards and chassis parts to sell on Head-fi...
  15. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    You will need to move your PSU board forward to make space for the transformers. And have you tried fitting the amp board with the brackets? Might want to double check that it will fit (and whether there is space for you to use board mounted XLRs), looks like it from here, though (as long as the brackets line up).
  16. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    It is correctable. And i love how the seller on head-fi has soldered the output wiring block backwards on the amp boards - that is some cramped space between the wiring block and the front plate...
  17. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    What board version do you have? That chassis would have been made for the shorter amp board with different transistor spacing and the quads of tubes are slightly closer together. Full size amp board does not fit. PSU board is pretty much the same so no issue there. Now I will be harassing you...
  18. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Who knows. All that seems clear is that for the past 3-4 years this fellow has been selling all of Lil knight's parts and builds, including the stacks of T2 PCBs from the failed group buy. Now he is selling the very T2 chassis set from the failed group buy. Also based in Viet Nam, as was lil knight. But then again, could be totally unrelated.
  19. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Hey, would you look at that. It looks like the over $10,000 that lil' Knight ran off with has actually been put to good use producing T2 chassis and boardsets. Didn't recognize it at first: And it would appear that you can buy these over on Head-Fi, available in different colours. Glad to hear that Tran isn't dead....
  20. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    It looks like the back plates are missing - maybe because they did not fit given the length of the amp board. Unless they used the shrunk amp board, I can't see an off the shelf heat sink working.
  21. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    The DIY T2 is the improved version of the Stax original. From what I understand, the newer/other versions that for example Joamat and Kerry have made are not necessarily improved versions of what Kevin did, but rather use some more affordable and more easily obtainable parts. I suspect that the interest in building this newer version will still be limited as the newer parts probably only shave $300-$400 off the parts cost of building the T2 - and since it would still remains a mega-buck build, what is an extra $300-400? And it is inevitable that those newer parts will soon be hard to find as well.
  22. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Guessing that is the case because if you want to build a T2, you can with the existing boards (albeit with a higher parts cost). The only thing I could see that might be worth while updating would be the power supply, but even then.
  23. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Joachim, let me know if you need any j79s, as I have a healthy supply.
  24. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    Guessing all the (fun) experimentation has over time totally conflicted that J79...
  25. GeorgeP

    The ultimate DIY? A Stax SRM-T2!

    They were in the gerbers, but Kevin might have corrected them. That said the error was simple to correct (and is documented in this thread). I do have one of the blue amp boards before the correction - almost too high quality with 4oz copper and very thick boards (you need a good iron to work on these boards).
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