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joehpj

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About joehpj

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  1. The ultimate DIY? A Stax SRM-T2!

    Was the trimmer in series of two 240R?
  2. The Multi Amp aka Dynalo Mk2

    When will you come to Taiwan? A HC Taiwan meet sounds interesting.
  3. The Multi Amp aka Dynalo Mk2

    I am at Taipei while ang is at the other side of Taiwan.
  4. The Multi Amp aka Dynalo Mk2

    What? Is mypasswordis also taiwanness?
  5. The ultimate DIY? A Stax SRM-T2!

    I was thinking if I should use regulated heater for the 6922. Those tubes amplify small signals and the amp itself has very high gain. And is there any problem to use same pair of leads for heating up the 4 front tubes?
  6. Cavalli Audio Liquid Carbon

    Yes. Chinese often call tubes as "gall bladder". It's just one word in Chinese. As an abbreviation.
  7. Technical Assistance/Advice Thread

    If low cost is the goal, JimL has a nice design SRX+. Simple and decent sound with fun of tubes.
  8. current feedback electrostatic amp

    @kevin gilmore once mentioned JFET input. I have some J74 and K170. Any possibility to use them? Though I think I'll still stick to BJT anyway.
  9. current feedback electrostatic amp

    Does this amp need extra standalone input stage? And can this amp ran single ended input?
  10. The Headcase Stax thread

    I believe SZ2 are 007A while SZ3 are 007mk2. (domestic / international version). All of my friends' 007A no matter manufacturing time are SZ2.
  11. Blue Hawaii BJT Build thread

    Any comparison with GG?
  12. Soekris DAC1541

    Both. I didn't see any extra amp for headphone jack. See pic 3. The rear output and headphone jack was controlled with relays by the switch on the front panel. One will automatically mute when the other is on. It will be really sloppy for amp but I don't think people buying this kind of DA will not have their own amps. Yes digital volume control. I assume it was done by FPGA. I didn't take the picture of the 48 lead QFP so I don't know if that was the volume control. It could be bypassed so not really an issue (if it's really done by FPGA).
  13. Soekris DAC1541

    This is not mine so I have to send it to the owner. I just got the chance of a brief listening. This DAC was really good for those have no skill/time to DIY. Compared with single 1021 w/ uber buffer fed into balanced CFA, uber has better sound stage and dynamics. 1541 has some more detail and sounded airy. The front panel is a convenient feature so changing digital filter and xfeed are much easier than DIY ones. The chassis however, was solid but compromised on finishing. It looked cheap. For a DAC now 1290 Euro, and made in Denmark, I can't expect it having a much better look though. The main issues here IMO, are 1) the performance of buck+LDO. I personally prefer some traditional way like transformer+ultra low noise linear PS. 2) the performance of the output buffer. It has only +-12V ps. But should be plenty for the output. It has different PS for digital and analog rail. The 1021 DIY module drive 5V digital parts form analog rail. Which was somehow compromised, too. So people have to choose form better buffer like Kevin's diamond buffer and some real ultra low noise LDO or isolated PS for digital/analog. PS. the OP based balanced buffer on 1021 is utterly shit. Use raw output and some better buffers.
  14. Soekris DAC1541

    I tried to take every detail. I still have some photos if someone need more details. Overall sound is good. This dac runs warm. Quiet curious about the buffer design. comments plz @kevin gilmore
  15. grounded grid

    Nice build! Quite interested about how will RK50 affects the sound. Never heard one before.
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