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About gepardcv

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  1. gepardcv

    The Headcase Stax thread

    I don't suppose anyone who tried the 007 with 009 pads experiment has a headphone measurement rig so we could take a look at the resulting FRs? Doesn't have to be perfect, just (moderately) consistent in measurements so the differences are meaningful.
  2. gepardcv

    Megatron Electrostatic Headphone Amplifier

    @Blueman2: You know you owe it to yourself to build one!! πŸ˜„
  3. gepardcv

    Happy New Year!

    Happy New Year to one of my favorite communities on the Internet!
  4. gepardcv

    WiFi Router Upgrade

    It's all fun and games until you realize that, without a Faraday cage, an EMP will fry all the out-of-production and extremely expensive transistors in your T2 amplifier.
  5. gepardcv

    Voluntary amp builders?

    NwAvGuy did add a lot of value to the consumer audio world, though I would dispute some of his measurements and claims. I have no substantive comments on his O2 (except that it was one of the first amps I built myself, and I quickly stopped using it because it produced the awful DC thump on turn-on and turn-off common in annoying-fi β€” which none of the significantly better amps I built later did). However, the ODAC is a piece of junk. With Mac system volume set above 50%, it produces nasty and extremely audible clipping. Perhaps my unit is defective. πŸ€·πŸ»β€β™‚οΈ I certainly don't intend to buy another one just to find out. Not a single other DAC ever performed so poorly in my system.
  6. gepardcv

    The Headcase Stax thread

    I used to think that. Then I built a C-Note set. 😁 I am aware of no reliable measurements of the later revisions of 007A, but I started with @Tyll Hertsens's measurements of the 007Mk2 from back in the day, adjusted by ear where I think they diverge, and then used AutoEq to find a 5-band PEQ adjustment suitable for the ADI-2. Then I toned it way down, because the Harman target and oratory1990's adjustments can be excessive. FWIW, here's the 007A equalization set I use now: band 1: shelf filter, +2.5dB, 75Hz, Q 1.0 band 2: peak, +2.5dB, 100Hz, Q 1.0 band 3: peak, +0dB, 1.0kHz, Q 1.0 band 4: peak, +2.5dB, 2.5kHz, Q 1.5 band 5: shelf, +0dB, 10.0kHz, Q 1.0 Fairly subtle, but IMO a significant improvement.
  7. FWIW, I tried a Utopia from one of my (full-size) Dynalo builds, and thought it sounded fine. Should be pretty similar to the various HeadAmp models.
  8. gepardcv

    The Headcase Stax thread

    To address the point about using EQ with Stax: I did a little adjustment for the 007A using the RME ADI-2 built-in PEQ, and would not go back to stock. (Also will not use a DAC without DSP in the future.)
  9. gepardcv

    KGSSHV Carbon Build Thread

    Spritzer probably does, though the Mjolnir Audio DIY page doesn’t seem to list them any more. You might want to ask him. I found his XLR input and Stax jack PCBs quite useful also.
  10. gepardcv

    KGSSHV Carbon Build Thread

    I'm not sure how much voltage that part of the circuit sees. In any case, I had better luck ordering a bunch of extra RN60D resistors and hand-matching them to <0.1% than relying on the manufacturers' matching process. YMMV, of course.
  11. gepardcv

    KGSSHV Carbon Build Thread

    That transformer looks like overkill to me. Maybe it's for a GRHV cranked to 450V? I think most people build at 400V. I ordered mine from Toroidy, with the following specs: Primary windings: 2x 115V (60cm leads) Secondary windings: 2x 335 VAC at 200mA (60cm leads) 16-0-16 VCT at 500mA (60cm leads) Works well. You should review the BOM carefully and check it against the boards to make sure you know what you're buying. You may need to replace some outdated components, but this is easy, and will help you make sure you understand exactly what you need. As for Stax sockets, I think most of us buy them from HeadAmp. You can use the eBay store: one, two, or five pieces. Happy building!
  12. gepardcv

    What are you reading now?

    Things have changed since we last discussed The Cursed Child. I saw it in New York last week... and, let's just say I almost immediately ordered tickets to see it again in San Francisco this fall. PS: I think the two-a-day format with a matinee show, dinner break, and evening show makes for a fabulous day.
  13. gepardcv

    The Multi Amp aka Dynalo Mk2

    Don't know about Mini compatibility (I'm still working on mine), but I built two full-size Dynalos with MPSW parts (I have a small stockpile). They run entirely cool as far as I can tell. I never checked with a thermometer, but there's no sensation of ambient heat if I hold my hand near the boards. Honestly seems like a good idea to use the cooler parts if you can get away with it, though it seems to me like it'll be a tight fit to stuff all those TO92 packages in such a small space.
  14. gepardcv

    What are you reading now?

    I'm still a huge fan of the Lone Wolf series by Joe Dever. If you grew up on that, check out https://www.projectaon.org/en/Main/Home for a really fun nostalgia trip.
  15. gepardcv

    A Game of Thrones Pilot Greenlit