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Helium

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About Helium

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  1. 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.
  2. 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.
  3. Helium

    KGSSHV Carbon Build Thread

    Digikey? Bought from them 1 week ago 50 pcs, still available.
  4. 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?
  5. 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.
  6. Helium

    The ultimate DIY? A Stax SRM-T2!

    What's wrong with these boards? By new boards do you mean published a week ago?
  7. 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?
  8. 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
  9. Helium

    (closed) Dynalo Mini enclosure group buy

    Payment sent. Thanks!
  10. 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.
  11. Helium

    Part Sourcing Assistance/Advice Thread

    Stupid question. Now searching for tube socket for KGST, GG and BH. Lot's of options. Aside from the material they are made of (bakelite, ceramic, teflon), I'm stuck at terminal type. https://www.ebay.com/itm/301444050005 https://www.ebay.com/itm/301838302161 Are these gold pins really intended to be soldered into PCB? Will solder adhere to gold plated surface? Or better look for sockets with leaf terminals?
  12. Helium

    2018 PCB Group Buy with TKD pots

    Hi Steve, any idea what price will be for TKD 4CP-2500 10K if I add 4 units? If it's not too late of course. Total count will be 7+4=11, which is over 10.
  13. Helium

    KG Balanced Dynahi build discussion thread

    Is that clear type LED 1.7Vf? It must be 1.7Vf (usually red color). Fill with solder all vias. Helps to reduce overall impedance of PCB.
  14. Helium

    KGSSHV Carbon Build Thread

    Can anyone confirm please that output power is the same in case of using SE inputs? Any drawbacks?
  15. Helium

    KG Balanced Dynahi build discussion thread

    Why are you biasing to 270mV only? With off-board heatsink, dynahi must be biased to 750mV (and even more if you like and as long as temperature is OK). With onboard heatsink, half of that (375mV) or more as long as temperature is OK.
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