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  1. peef
    Post

    Line Transformers for Digital Audio

    As someone who goes builds a lot of amps with line level transformers and has spent the better part of the last month measuring nanovolt levels of...
    Post by: peef, Feb 13, 2024 in forum: DIY
  2. peef
    Post

    Schiit Modius E And Cinemag CMLI-15 Level Input Transformers: Uh Oh It's Magic

    It depends. Step one is of course to remove the DC stimulus, so it's worth actually measuring if your specific DAC does that. I'm fairly sure the...
    Post by: peef, Dec 2, 2023 in forum: Modifications and Tweaks
  3. peef
    Post

    Schiit Modius E And Cinemag CMLI-15 Level Input Transformers: Uh Oh It's Magic

    I've been extensively measuring transformers for some time and came across some idiosyncrasies when looking at the distortion surfaces. Ideal...
    Post by: peef, Dec 2, 2023 in forum: Modifications and Tweaks
  4. peef
    Post

    Mini-Noise Nuke Measurements

    It looks like you're running a common mode choke (the Triad CMF23H-103231) with the windings in series? I'd be cautious with this sort of...
    Post by: peef, Nov 9, 2023 in forum: Audio Science
  5. peef
    Post

    Real audio science - exploring beyond the obvious and bringing back true science and exploration

    Agreed, I don't think the square waves tell us anything that the frequency (and phase) response don't already tell us. And with the frequency...
    Post by: peef, Aug 28, 2023 in forum: Audio Science
  6. peef
    Post

    Beast Jr. with 42 JFETs

    If you're not already familiar with it, it might be worth taking a look at Susan Parker's amp. I'd give some thought to leaving the OPT on the...
    Post by: peef, Aug 24, 2023 in forum: DIY
  7. peef
    Post

    Beast Jr. with 42 JFETs

    Sounds like a problem for a cascode. This is how people have been getting around the dissipation limits of the LU1014D at diyAudio. I would...
    Post by: peef, Aug 24, 2023 in forum: DIY
  8. peef
    Post

    Real audio science - exploring beyond the obvious and bringing back true science and exploration

    I gave this a shot with a 47 ohm resistor to terminate the secondary, and measured at 200Hz, 2kHz, and 20kHz. Image attached because it's huge....
    Post by: peef, Aug 23, 2023 in forum: Audio Science
  9. peef
    Post

    Beast Jr. with 42 JFETs

    This is a really cool project. SE JFETs sound great, and hats off for not using up 42 rare and expensive JFETs when the J112 is probably the...
    Post by: peef, Aug 23, 2023 in forum: DIY
  10. peef
    Post

    Real audio science - exploring beyond the obvious and bringing back true science and exploration

    I'm working on an amp that I had intended to build with nanocrystalline core output transformers, but recently had the opportunity to pick up some...
    Post by: peef, Aug 21, 2023 in forum: Audio Science
  11. peef
    Post

    DIY talk

    On the off chance someone needs a 1mA current source/sink, I measured a bunch so that you don't have to. People who enjoy poor data visualization...
    Post by: peef, Jul 30, 2023 in forum: DIY
  12. peef
    Post

    6GM8 <-> 6DJ8

    I've been using the LND150 boards for the better part of the last decade. They've just been waiting for their prime time. :) It shouldn't be too...
    Post by: peef, Jul 16, 2023 in forum: DIY
  13. peef
    Post

    6GM8 <-> 6DJ8

    You'll need two in a +/-24V arrangement if you want to DC couple the inputs. That's right. The original schematic runs the tube in cathode bias...
    Post by: peef, Jul 15, 2023 in forum: DIY
  14. peef
    Post

    6GM8 <-> 6DJ8

    Here's one option. [ATTACH] You may need to tweak the value of R2. This sets the current running through the tube, and therefore how much...
    Post by: peef, Jul 14, 2023 in forum: DIY
  15. peef
    Post

    Real audio science - exploring beyond the obvious and bringing back true science and exploration

    This lines up with my experience, too, when designing equipment and measuring finished pieces. When comparing two iterations of the same...
    Post by: peef, Jul 14, 2023 in forum: Audio Science
  16. peef
    Post

    atomicbob's SMPS Noise Nuke for HP amps with external SMPS

    I don't think these inductors are rated for DC. If that's the case, DC will saturate the core and cause the inductance to drop, which ultimately...
    Post by: peef, Jun 30, 2023 in forum: Headphone Amplifier Measurements
  17. peef
    Post

    Differences Between the SB and non-SB Stax Transformers

    This is fantastic. Thanks for sharing your measurements and analysis. I have a suspicion that the differences that you are measuring and hearing...
    Post by: peef, Feb 28, 2023 in forum: Portable and Other Gear Measurements
  18. peef
    Post

    Best amps for orthos

    I wouldn't worry too much. I've tested a few orthos (ranging from the efficient 18 ohm MM-500 to a Susvara) off a transformer coupled amp with a 5...
    Post by: peef, Feb 22, 2023 in forum: Headphone Amplifiers and Combo (DAC/Amp) Units
  19. peef
    Post

    DIY talk

    I'd be surprised if you found anyone who has heard both designs. SE amps tend to be very sensitive to part selection as well, so the "how" matters...
    Post by: peef, Feb 13, 2023 in forum: DIY
  20. peef
    Post

    DIY talk

    It's a classic for a reason, if not a bit long in the tooth. For something a bit more modern, I'd take a look at the Bartola 45 amps. They revised...
    Post by: peef, Feb 9, 2023 in forum: DIY
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