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About Helium

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  1. 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.
  2. 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.
  3. KGSSHV Carbon Build Thread

    Can anyone confirm please that output power is the same in case of using SE inputs? Any drawbacks?
  4. 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.
  5. 2018 PCB Group Buy with TKD pots

    But did anyone confirm that they are good for order (no errors ets.)?
  6. The Multi Amp aka Dynalo Mk2

    You may want the latest PS900 (2nd one), not PS800.
  7. Dynalo Mini enclosure group buy

    Paid. Thanks!
  8. 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.
  9. 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.
  10. 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.
  11. krell ksa5 klone

    I'm making it. Boards are ready, paired with 2xGRLV and nice amb's deltas. Cases are not))
  12. 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.
  13. goldenreference low voltage power supply

    mwl168, Pars thank you. Pars would you mind sharing Gerber and BOM for discreet rectifier board please? I don't think that I will participate in the nearest PCB GB, but I'll try to have them made when I order PCBs for myself next time.
  14. goldenreference low voltage power supply

    Pars, any chance you have more rectifiers left? I'd like to try them out on one set of GRLVs.
  15. Dynalo Mini enclosure group buy

    Interested in x1 (maybe x2, depends on final price) with Alpha FP.