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About joehpj

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  1. joehpj


    Stylish shoe!
  2. joehpj

    The Headcase Stax thread

    It must be a counterfeit Hawaii from China. Huawei.
  3. joehpj

    SRL300 Limited

    stax just released their new portable(?) amp. https://mobile.twitter.com/STAX1938/status/973765646667325440
  4. joehpj

    KGSSHV Carbon Build Thread

    STN9360 ran out of stock on mouser. Can I use STN9260 or PBHV3160Z instead?
  5. joehpj

    KGSSHV Carbon Build Thread

    As a Taiwanese, I don't eat choudofu. I just can't stand that smell. Laowei, please let me know when you visit Taiwan.
  6. joehpj

    KGSSHV Carbon Build Thread

    I buy insulation ceramic kits, screws, nuts, or something like that from Taobao to cut the cost. I usually buy some samples first before I buy a lot. After I bought fake 10M90S, I've never bought high voltage silicons from China. It's indeed better not to buy form China when building high voltage amps. IMHO, it was like gambling. When you hit the jackpot, it explodes. LOL
  7. joehpj

    KGSSHV Carbon Build Thread

    Buying from Chinese needs some more knowledge to know if the parts are genuine. I've bought from Taobao of 50 10M90S. Looked fine but turned out all fake. If you know which vender to buy from, of course you can save a lot of money.
  8. joehpj

    What Are You Building Today

    Whoa. Is this a power amp?
  9. joehpj

    Blue Hawaii BJT Build thread

    Any comperison?
  10. joehpj

    unbalanced/balanced to balanced tube input

    If I am going to drive high independence headphones with this, what should I do? 1) add triple darlington stage like tubehybrid/CFA did 2) add paralleled darlington stage like dynahi
  11. joehpj

    Blue Hawaii BJT Build thread

    updated the BOM. 2K trimpot changed to 4pcs. 470R changed to 1/2w. 5W zener simply because it's slightly cheaper than 1/3w .
  12. joehpj

    The ultimate DIY? A Stax SRM-T2!

    Studied T2 schematic and found filament of EL34 was connected to -500V. Is there any benefit to separate -500V from AC in order to reduce AC noise? I was thinking floating the filaments just like GG and BH.
  13. joehpj

    Blue Hawaii BJT Build thread

    470R was connected direct to the tube structure so it will get hot easily. You can either lift the resistor or use higher power rating ones. I forgot why I used 5w. and the number of the trim pots. Please follow the silk screen. I will check the BOM later.
  14. joehpj

    The ultimate DIY? A Stax SRM-T2!

    Oh I was asking about the input attenuator. I used 10K for Carbon, GG which was JFET input. Should I increase to 25K or 50K for tube input? And thanks for the information! One more thing. Was the R65-R68 on the PS schematic used to keep the filaments grounded? I wanted to adopt the T8000 way of regulated input tubes filament power supply. So I will have to remove the two 47R of 6.3v and keep the rest two tied to 0V, right?
  15. joehpj

    The ultimate DIY? A Stax SRM-T2!

    What value of pot should be used? Kevin said he always use 10k but I wonder if it should be higher because of tube input?