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Helium

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About Helium

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  1. Helium

    Dynalo Mini enclosure group buy

    Payment sent. Thanks!
  2. 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.
  3. 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?
  4. 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.
  5. 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.
  6. Helium

    KGSSHV Carbon Build Thread

    Can anyone confirm please that output power is the same in case of using SE inputs? Any drawbacks?
  7. 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.
  8. Helium

    2018 PCB Group Buy with TKD pots

    But did anyone confirm that they are good for order (no errors ets.)?
  9. Helium

    The Multi Amp aka Dynalo Mk2

    You may want the latest PS900 (2nd one), not PS800.
  10. Helium

    Dynalo Mini enclosure group buy

    Paid. Thanks!
  11. Helium

    The Multi Amp aka Dynalo Mk2

    Try Metcal PS-900. Clearer better than Hakko 888d (I have both). Hakko 888d is a great station, but sorry to say, Metcal is better. Reason I still keep Hakko is that I already invested in lots of Hakko tips, including so called 'microwave' tips which I use for soldering SOIC packages and the like (when heat transfer speed is not critical). But most of soldering is done by Metcal, including joints to heavy ground planes.
  12. Helium

    Balanced to unbalanced board

    To be honest, modern BC546/556 from ON are measuring like crap. Last lots I bought (genuine of course) measured Hfe 250-280 @ 10uA base current, some hardly reaching 300. Try to get from AMB his NOS stock from Fairchild. As I remember they measured 300-330 and up consistently. If I recall correctly, BJT transistor leads from amb didn't magnetize as well. Now I feel sorry that I didn't have time to order and have them shipped from him for my CFA amp which is in progress.
  13. Helium

    Balanced to unbalanced board

    No, formed leads are what fits best for this board (though looking at the PCB you might think that lead spacing is for straight leads. No, it for formed.
  14. Helium

    krell ksa5 klone

    I'm making it. Boards are ready, paired with 2xGRLV and nice amb's deltas. Cases are not))
  15. Helium

    krell ksa5 klone

    Did anyone run KSA5 at 30VDC? I like all my dynamic amps running at 30VDC. I'm scared a bit to fire it up. Don't want to fry anything. Balanced version was more difficult and expensive to make than I expected. P.S. I'm using OPA445 and G5V-2-H1-DC24 relays. And all other components are according to BOM and PCB silkscreen.
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