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mtaifa

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About mtaifa

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  1. mtaifa

    The Headcase Stax thread

    Can someone recomend me a good stand for the 007? ebay i.e.
  2. mtaifa

    The Headcase Stax thread

    Thanks! I already removed the pot and will be installing off board pot. I will also remove the 4 small caps, C10 and C11 (+C7 and C16)
  3. mtaifa

    The Headcase Stax thread

    I've started tearing into the KGSShitbox and noticed some differences from the earlier version. R9-R12 are 560R on my version, 2.2K in older rev. R40 + R47 are 1.46K on mine, seems to be 500K on original. See pic: https://i.imgur.com/MgNuP0N.jpg Should I change some of these?
  4. mtaifa

    Balanced to unbalanced board

    Hi folks, For some reason I cannot access anything on http://gilmore.chem.northwestern.edu/boards/ Is there a mirror somewhere? I might need a small pre between a turntable RIAA and my KGST. Can I use the unbalanced to bal with no buffers for this?
  5. mtaifa

    kgst

    OK, thanks. I think I will leave the gain alone. Thanks, that looks like a fun project, I'll look into it I'll research the RIAA board also, maybe I can just adjust the gain there
  6. mtaifa

    kgst

    Another question, is it possible to adjust the gain? I have an old turntable with built in RIAA, and the volume at max is a little low.
  7. mtaifa

    kgst

    I'm nearly done, everything assembled in the case. Everything works perfectly Learned a lot building this. Like the fact that connecting the HV and LV transformers in series doesn't really work that well. And that it is a good idea to disconnect the mains before using a knife to remove some shrink tubing from the IEC socket. I was leaning both my elbows on the chassis at the time, giving me a small shock resulting in me butting the blunt end of the knife into my forehead. Made me feel real smart and special. Luckily it was only one phase to ground, and the chassis is anodized and have a pretty high resistance. I'm proud of this project because I actually finished it. Told myself not to start using the amp before the casework and everything else was done, unlike all the halfway done projects laying around my room. (like a DAC with no top cover etc) Some pics: https://imgur.com/a/wnFi9 (even though it might look like it, I'm not actually a professional metal worker. Also I'm missing a lot of the right tools for the job. I think it looks half decent, though) The chassis and some of the neutriks are from an old never-finished amp, wanted to use the side heatsinks so I extended the legs of the 10M90's a bit. Ordered wrong small heatsink for the PSU, had to slightly mod a larger one to fit. Powerbutton is ebay stuff, orange LED. SQ on this thing is awesome. (007MK1). At first I was a bit dissapointed, the soundstage was kind of small, all inside my head, but then I remembered switching opamps on my soundcard (xonar essence STX) a while back. Switched back to good old Audio-Gd disceets and everything changed. Very happy now! Next investment will probably be a balanced Audio-Gd DAC, but for a while the STX will have to do. I'm also very impressed by the KGSSHV Mini PSU, very stable and very cool operation only getting slightly warm after some hours of use. I know nothing of electronic design, but would it be easy to build a small version of this with only LV for +12V and +5V for powering the soundcard? Thanks to every one that has contributed to this forum for all the info and help, and especially spritzer for answering my noob questions!
  8. mtaifa

    kgst

    False alarm! Reassembled and everything works. I did reflow some of the joints, but they were already fine. I found a tiny bit of metal debris in the chassis, under where the board was mounted, that was probably it. Must have fallen of the board when I took it out.
  9. mtaifa

    kgst

    All solder joint checked and they seem ok. Pots are doing what they are meant to do it seems, it's the same measurements on both boards. Attached some pics, if you have a chance to look over quickly I would really appreciate it. If there is a bad component, how should I go about finding it? some strategic places to measure voltages, or resistance to ground or something?
  10. mtaifa

    kgst

    So, turnes out I need some more help. Build is complete, and right channel is working perfectly. Left channel is partly dead. It's mostly silent except for one small part of the pot, about 3/4 way up and for 1mm turn approx. In this small area I get hum. Also sometimes got distorted sound in this area, but now only hum. Voltages are all good. Swapped tubes between channels, no difference. Tried disconnecting the input from the board, gets constant hum then. Have also replaced the 1.2kohm's on both boards with 2x 2.2k. On the working channel the balance and offset was quick and easy to adjust. On the left channel it was way harder, it jumped a lot when turning the pots only a little, and it also seems much more erratic, jumping several volts all the time. (-5 to +5 and everything in between). Any tips for where to start looking, or what I can measure on the boards to find the culprit?
  11. mtaifa

    kgst

    Wired in a 10k in parallell (1070k), works fine now Thanks for the quick reply!
  12. mtaifa

    kgst

    Connected everything, fired it up, nothing is buring I'm not able to zero out the offset, though. Balance is good, but can't get lower than around 10V on the offset. Series resistor is 1.2k, voltages are +/-355. By using the blance pot I can get the offset to zero, but then the balance is of course screwed. Will I have to go lower on the 1.2k?
  13. mtaifa

    kgst

    I'm nearly done solderering my KGST. PSU is done and stable at +362v/-364v. Will be testing it today for the first time One question, on the pot I have, an Alpha 50k, first gang is 49k, second 48k, 3rd 47k and 4th 46k. Will this be an audible problem, or will the amp design handle this?
  14. mtaifa

    The Headcase Stax thread

    Looks to be the same as the small shitbox except a different PSU?
  15. mtaifa

    The Headcase Stax thread

    If I swap the pot for a 50k LOG, will I have to change or remove some resistors?
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