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gepardcv

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About gepardcv

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  1. To be clear, I want a set of Mini T2 boards along with a power supply set... was planning to use them together. Whether I'll want more sets will depend on price breaks.
  2. gepardcv

    DIY mini T2 Build Thread

    I’m in for one full set, possibly more depending on price options.
  3. gepardcv

    DIY mini T2 Build Thread

    I've bought LT1021 from Digi-Key in the past. Doesn't look like there's a ton in stock, but I think it comes and goes.
  4. gepardcv

    DIY mini T2 Build Thread

    I wonder if there's a good way to adapt the GRHV. Crank the negative rail to -460V, keep the positive rail at +400V, and (if possible) use a voltage divider to make a +220V. Way simpler and smaller than the T2 PSU.
  5. gepardcv

    DIY mini T2 Build Thread

    That is so impressively miniaturized that pairing it with the beastly T2 PSU and its three huge transformers seems just wrong.
  6. gepardcv

    stax t8000 clone (well sorta)

    Looks neat. What power supply did you use?
  7. gepardcv

    stax mafia circuit boards

    A1. The KGSSHV uses some out-of-production transistors. While you can still buy them, fakes can be a problem, and reputable suppliers (like bdent) charge a premium. The Carbon is essentially a strict upgrade from the KGSSHV, with (I believe) all current production parts. The major advantage of the KGSSHV over the Carbon is the availability of versions with on-board heatsinks, which simplifies the metalworking considerably. You might consider building a KGST instead. It’s a great amp, and aside from matching 6S4A tubes, I found it generally pretty easy to make. Also consider the SRX Plus (though I haven’t made one of those yet). Search here for threads discussing these builds. A2. Only you can decide that. It pays to try before you buy. A3. The Carbon and Megatron are no more dangerous to build than any other device operating at comparable voltages.
  8. gepardcv

    The Multi Amp aka Dynalo Mk2

    This is so interesting. The full-size Dynalos I built are the coolest-running amps I have. Really surprised at how much hotter all the smaller parts end up. I want to make a mini, but the heat issue worries me.
  9. gepardcv

    KGSSHV Carbon Build Thread

    My ODAC is a piece of garbage. It clips loudly, audibly, and obnoxiously when macOS system volume is set to >50%. Maybe it's broken. Not one other DAC I tried does this, at any price point. If you want an integrated DAC+amp solution for your Carbon, you're much better off with Soekris boards. Still not recommended: (1) Carbons run somewhat hot, and I don't know if it'll take much to fry the DAC boards, (2) you'll have a much more complicated internal layout, (3) you'll need a larger case, (4) you'll have a much more complicated power supply setup to deal with. General piece of advice in addition to what others have already said: get some experience drilling and tapping external heatsinks. I destroyed the first one I worked on.
  10. gepardcv

    The Headcase Stax thread

    Over 3k USD for a slow-ass f/5.6 lens? I’ve had good luck with Leica glass and enjoyed rangefinders in the past, but that’s just silly.
  11. gepardcv

    The Multi Amp aka Dynalo Mk2

    Wait, did anyone actually determine that the heatsinks don't help cool the transistors? That's... counterintuitive.
  12. gepardcv

    The Headcase Stax thread

    Resurrecting a year-old post about the iESL. I've been thinking about this. What exactly is the problem of putting a cap after the ballast resistor? Is it just that having a capacitor as the last thing on the bias line would cause inrush current to surge while the cap is discharged and fry the diaphragm? If so, wouldn't the resistance still be set by the ballast resistors (5M or whatever) and so therefore still limit the current? Assuming voltage remains a constant 580V.
  13. gepardcv

    2018 PCB Group Buy with TKD pots

    My stuff came in. Thank you Steve!
  14. gepardcv

    The Headcase Stax thread

    Monoprice posted a product page for a $700 electrostatic system: https://www.monoprice.com/product?p_id=33455. No description or specs, but the pictures look like that might be a Stax plug...
  15. gepardcv

    (closed) Dynalo Mini enclosure group buy

    Also paid. Thank you!
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