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About samsie

  • Rank
    Limited Edition Bronze Participant


  • Occupation
  • Hobbies
    fountain pen collection, fishkeeping
  • Headphones
    Stax SR009 Grado RS1 Magnum Grado SR-325i Hifiman HE-6 Stax SR404 V-moda 100 Sennheiser HD800
  • Headphone Amps
    Darkvoice THA336 (mod) Elekit TU882 (mod) Objective 2 Sense G3 (mod) Sense G3-T7 (mod) Sense G5 Budgie SE OPPO HA-1 KGST Home made clone amp: "Mapletree Super II" "Grado RA1" "RSA XP7"

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  1. samsie

    unbalanced/balanced to balanced tube input

    Dear Kevin, I find the heater power supply portion to be rather handy. Would you please cut the HV supply portion away so that I can use the heater power supply portion for mini T2 project? Thanks Sam
  2. samsie

    current feedback electrostatic amp

    The amp was getting really hot at 70°C. It was running at 22.5 mA. I have to reduce the bias current. Should I change the 2k ohm resistor or the 500k one? I am a bit confused.
  3. samsie

    and now for something completely different part 3

    understood. thanks to you all
  4. samsie

    and now for something completely different part 3

    CFA2 (CFP) - current feedback amp I still cannot figure out how to connect them into balanced version of CFA2 (CFP) - current feedback amp as they are single end type of pcb. I know I need four boards, but how do I connect the negative input rail ? Your help is much appreciated.
  5. samsie

    The Multi Amp aka Dynalo Mk2

    And how do you do the printing? Sam
  6. samsie

    transconductance amp

    This was completed an hour ago. It worked though I did not do any measurement. I tried it with my only planar Hifiman HE6. The volume was a dummy. I used a preamp. I could not afford a decent volume control for individual headamps.
  7. samsie

    DIY mini T2 Build Thread

    One set for me, please
  8. samsie

    The Multi Amp aka Dynalo Mk2

    thanks all, I ordered. I know I'll have to handle SMD sooner or later. In the mean time, I am searching on the web regarding how to mount the TPS7A3301 and TPS7A4001 directly on the board. Maybe I could finish it before the modules arrive? Sam
  9. samsie

    The Multi Amp aka Dynalo Mk2

    Please help me with the TPS7A3301 modules, I could only find this https://www.ebay.com/itm/TPS7A3301-Ultralow-noise-LDO-regulator-3V-18V-1V-step-1A-LM337-79x-replace/253593923500 It appears that it could only provide -18v, not the -20. Am I missing something? After spending half a day staring at the pcb without any progress. I gave up on soldering the chips to the board by myself.
  10. samsie

    (closed) Dynalo Mini enclosure group buy

    Payment sent. thanks
  11. samsie

    2018 PCB Group Buy with TKD pots

    agree, yes, four sets power supplies, many projects to be completed. I changed the quantity to 2 sets
  12. samsie

    DIY Stax SRM-T2 Chassis Group Buy

    sorry, a bit too much for me. Maybe I would join in when there is a group buy for a set of transformers sam
  13. samsie

    DIY Stax SRM-T2 Chassis Group Buy

    I am interested in the chassis set. I would like to have an estimation before I commit.
  14. samsie

    Closed - Megatron and GRHV PCB GB

    two sets of GRHV split, please Sam
  15. samsie

    Transformer phase / no phase marking

    I used a 9v battery and a multi-meter. connect the 9v battery to the primary temporarily and see the fluctuated secondary output voltage to be positive or negative. then you know which way to go. I have not tried the KG methods but it appears to be very convenient.