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About Helium

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  1. Helium

    The ultimate DIY? A Stax SRM-T2!

    Beautiful! Kerry, how did you treat the chassis to achieve polished surface? Seems to be steel, not aluminum? Is is mechanically polished or galvanized?
  2. Helium

    goldenreference low voltage power supply

    Can you keep the physical size and standoff hole placement same to GRLV with RS402L (goldenreference6d.zip)?
  3. Helium

    Technical Assistance/Advice Thread

    Just wanted to share one of my most favorite acquisitions among hundreds of manual and electric tools. Heinrich deep throat is capable to punch holes in the center of 400mm panel (hello large enclosures like Modushop Slimline). No burrs, very clean holes, any hole is perfectly perpendicular to surface, and waaayy more accurately positioned than made by drill bit as you can never avoid drill bit wandering. Precision is close to CNC milling. I also use smaller punch Roper Whitney XX with smaller throat.
  4. Helium

    Technical Assistance/Advice Thread

    Apparently a good tool, will get one. Wish it had No-mar teflon face like some countersink microstop limiters.
  5. Helium

    KGSSHV Carbon Build Thread

    You will need 1 x HV board with bias section and 1 x HV with +/- 15VDC low voltage section. If you populate +/- 15VDC low voltage section on one of HV boards, you don't need separate GRLV board. If you go with separate GRLV board (more luxury solution), you can use either single GRLV board producing both positive and negative 15VDC, or split boards, each producing +15VDC and -15VDC. Also, if you go with separate GRLV board, you can do with 2 x HV boards with bias section (saves money if you order boards at PCB house). You need to populate bias section on one them only. Correct. Nothing required. It will accept unbalanced input as well, sound volume will be less. 7815 is noisier than GRLV. GRLV presumably produces cleaner +/-15VDC. Piece of advise: go with amb's Sigma22 for low voltage. Much cheaper than GRLV to buid. That is single +/- GRLV. You can go with split positive and negative GRLVs, as mentioned above. Not recommended IMHO. What if you need to upgrade your DAC in the future? Not needed for Carbon (=no tubes). Leave unpopulated. Use GRHV onboard low voltage section, if you want to cut costs. Or use Sigma22 instead of GRLV, and order 2 x HV bias boards instead of 1 x HVbias + 1 x HV w/low voltage. Really not many options to save money. Most expensive parts are main filter caps (40 USD/ea, and you need 4 of them), balanced potentiometer of your choice, transformer(s) and casework. None can be dropped out.
  6. Helium

    The Multi Amp aka Dynalo Mk2

    Actually it depends of user's cables. If these are highly capacitive, it may start to oscillate, who knows. Ferrite _may_ help with it.
  7. Helium

    The Multi Amp aka Dynalo Mk2

    For me it doesn't look like IC (THAT) related issue. Does the hiss increase as he turns the volume up? If yes, then it's likely to be some grounding issue. Otherwise it may be oscillation (though I don't know if dynalo is prone to oscillation). Let him try to temporarily fasten hinged ferrite cores on either headphone cable or input cables or both and see if it makes difference.
  8. Helium

    KGSSHV Carbon Build Thread

    Digikey? Bought from them 1 week ago 50 pcs, still available.
  9. Helium

    KGSSHV Carbon Build Thread

    Hmm, Mouser has C2M1000170D in stock. I bought 12 pcs week ago, and they are still available. Am I missing anything?
  10. Helium

    The ultimate DIY? A Stax SRM-T2!

    There is plenty of 1N4007 diodes. P/N E3/54 you provided is just a package type. Search another one, this generic diode cannot be out of stock for sure. https://www2.mouser.com/ProductDetail/Vishay-Semiconductors/1N4007-E3-54?qs=sGAEpiMZZMtbRapU8LlZD0HbIjlpuZ44RKYLoMCkjXw%3d Same for 0.1uF 50V. There are tons of alternatives. If you would like to stick to Kemet, try searching Kemet 315, 320 series as well. 100V is OK also. Just mind lead spacing.
  11. Helium

    The ultimate DIY? A Stax SRM-T2!

    What's wrong with these boards? By new boards do you mean published a week ago?
  12. Helium

    The ultimate DIY? A Stax SRM-T2!

    Question to Mr. Gilmore: Any chance to see your photos linked in this thread? Particularly about T2 build progress (making enclosure, stuffing the boards etc. Actually I'd love to see all of them). Could they be uploaded somewhere?
  13. Helium

    The Multi Amp aka Dynalo Mk2

    amb explained here, same for susy dynalo: https://www.amb.org/forum/susy-dynahi-v2-t2868.html#p26515
  14. Helium

    (closed) Dynalo Mini enclosure group buy

    Payment sent. Thanks!
  15. Helium

    Part Sourcing Assistance/Advice Thread

    Thank you jose and spritzer. Thanks for the hint to have valve inserted. I usually do the same when soldering Mill-Max DIP sockets in order to prevent pins from moving when socket plastic is heated.