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JoaMat last won the day on August 28 2018

JoaMat had the most liked content!

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About JoaMat

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  • Birthday 12/26/1955

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  1. JoaMat

    Megatron Electrostatic Headphone Amplifier

    More Sort Guld. A Søren built amplifier is easily recognized. Very nice!!
  2. JoaMat

    grounded grid

    Nice work indeed. I like the two box approach. The transformers – are they DIY made?
  3. JoaMat

    The Multi Amp aka Dynalo Mk2

    Maybe one could change resistors on Alexey’s board to achieve -20 V.
  4. JoaMat

    Happy Thanksgiving everyone!

    Happy Thanksgiving!
  5. JoaMat

    KGSSHV Carbon Build Thread

    What is the thing with relays between the amp boards? Indeed a nice and interesting build. Great work. ...I’ll go to Biltema tomorrow and check what acrylic they have.
  6. JoaMat

    The Multi Amp aka Dynalo Mk2

    I don't remember, but capacity is 3.3Ah when new. How much is the current of the mini?
  7. JoaMat

    The Multi Amp aka Dynalo Mk2

    Found this in closet. I guess it’s some kind of charger I built a couple of years ago. Six Mean Wells and charger regulators and each cell has his own charger. Red light will probably turn green when fully charged. I don't remember but I will see in a couple of hours.
  8. JoaMat

    The Multi Amp aka Dynalo Mk2

    I used the battery pack summer 2016. LiPo 6 cells, one pack each rail, give you some 22 volts reduced by the regulator. Those LiPo packs are used by RC people. I bought from hobbyking.com.
  9. JoaMat

    The Multi Amp aka Dynalo Mk2

    See below.
  10. JoaMat

    stax t8000 clone (well sorta)

    I’m sorry, but - I will not compare my, in kitchen made, amplifier with the famous DIY T2. One way to compare… well, build one – it’s fun. Schematic above.
  11. JoaMat

    stax t8000 clone (well sorta)

    Have been listen to the new amplifier with EML 20B v4 tubes for a couple of days. Since 20B pinout and heater voltage differs from EL34 I use adapters. Maybe it’s about time to make a board dedicated for the Emission Labs tubes. The tubes looks amazing and have printing on the glass. In this early stage layout the printing and the front of the tubes are facing the listener. I found the big tube 3D model (300b) at grabcad.com, done by Andrew Whitham, United Kingdom.
  12. JoaMat

    stax t8000 clone (well sorta)

    I am very satisfied with the outcome of this build. Some background. I wanted to build an amplifier based on the T2 but simpler. There isn’t anything I’ve invented. I just copied and pasted pieces and ideas from Kevin, Kerry, Birgir et al - without asking for permission. Draw up a schematic this morning of the amplifier in the same “fashion” as DIY T2 by Kevin Gilmore. The amplifier doesn’t have R66, which is suggested by Kevin. Be aware of errors since I did this in a rush. As about the sound. I AM VERY HAPPY with her. But that’s maybe like asking me how much I love my four grandchildren.
  13. JoaMat

    stax t8000 clone (well sorta)

    Now with top plate. Aerial view, the two holes in front of outer small tubes are for balance trimmers. Adjust balance after some time of warm up and then insert jumpers for the servos.