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chinsettawong

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Posts posted by chinsettawong

  3. The Headcase Stax thread

    in Headphones

    Posted

    Inside the Stax SRD unit, there are a pair of step up transformers for audio signal and a step up voltage circuit for the bias voltage.

    The audio signal needs to be amplified a lot for it to be played on the electrostatic headphones.  Many of electrostatic amps can swing the audio signal to over +/- 400V.  The bias voltage for electrostatic headphones also needs to be stepped up from the main AC voltage.  For Stax headphones, the bias voltage is 580V.  So, the amplified audio signal together with this bias voltage of 580V can actually be more than 1KV. ;)

     

     

    • Like 1

  10. Kaldas Research

    in Headphones

    Posted

    42 minutes ago, Tachikoma said:

    Awesome, too bad I left Bangkok last week :P @chinsettawong: sorry for not visiting, have been busy practically every day for the last year. 

    Make sure that you let me know when you come again next time.  Let’s have a beer together.  :)

     

     

  11. Kaldas Research

    in Headphones

    Posted · Edited by chinsettawong

    Aumkar and I had a good time on Saturday.  We started the day with a short city tour.  I took him to visit the Temple of Emerald Buddha, Grand Palace, and Wat Poh.  Then we had lunch with a few of my headphones lover friends.  After that, we had a mini headphones meeting.

    At the meeting, we had Stax SR007 MK1, SR009, My DIY Orpheus Clone, Omega Clone, JF Clone, and of course Aumkar's RR1 headphones.  I brought my KGSSHV Carbon, KGST, and KG Grounded Grid, and my friend brought his DIY 300B single ended amp.  

    The RR1 showed very good performance with all the amps we tried.  The treble was just right and the bass was impactful and deep.  I think they're good headphones for fast music.  

    Aumkar kindly gave me a pair of RR1 and an extra pair of drivers for me to play with.  Here are some pictures of the stators, spacers, and dust shield.  

    EB80761-C-A6-C0-4-EC1-9408-16-D3-D586-F6

    DEC04-DA1-7-E8-F-4-E34-838-B-DCD43-CE279

    C524-B803-9911-4-DDE-88-CB-ACA3-EE40-B9-

    258-CF6-D8-D36-A-40-DF-BAEF-A0115-E00161

    I'm very impressed to hear that he actually machines down the 4 mm aluminium sheet to 0.8 mm so that he can have the absolutely flat stators. 

    The look and feel of the headphones are good.  Aumkar told me that all the cups are 3D printed, sanded, and painted in house.  With all these labor intensive works, the result is quite impressive.  I basically can't tell that these components are 3D printed at all. 

    All my Thai friends like his headphones and have already asked me to help place their orders with Aumkar.  :)

     

    • Like 6

  13. What Are You Building Today

    in Do It Yourself

    Posted

    5 hours ago, JoaMat said:

    I’ve retested and I got about the same results. Also tested a pair of SR-007 mk2 and then I got graphs more like your Orpheus Clone and 007mk1.

    I’m very satisfied with the bass, well not as good as 009S but good for my DIY headphone. I’ve tried different diaphragms and some of them are terrible, but I actually manage to do some better. Another thing is that my home made phones are not as sensitive as Stax and the diaphragms need time to charge. They start soft and after half an hour or so the sound reach it’s max.

    Here is how I stretch the Mylar film. 12 inch inner tube and Scotch Magic tape.
    IMG_0335.thumb.JPG.7f6bebe1ed88ffce61bfbcde9fb42080.JPG
     

    I think you've stretched the diaphragms too much.  :)

     

    • Like 1

  14. What Are You Building Today

    in Do It Yourself

    Posted · Edited by chinsettawong

    These are my measurements:

    Omega-MK1.jpg

     

    Orpheus-Clone-R-3-positions.jpg

     

    Orpheus-Clone-L-3-positions.jpg

     

    I also don’t really know how to read them.  However, my headphones’ graphs show pretty similar patterns to the Stax’s 007 MK1’s.

    Your headphones’ graph is so flat.  Maybe you should retest them again.  How is your bass compared to the 009S?

    • Like 1

  20. What Are You Building Today

    in Do It Yourself

    Posted

    17 hours ago, JoaMat said:

    Listened to this for the first time today.

    IMG_0316.thumb.JPG.9c860408a58baebf114497647825e048.JPG
    Pad is from a SR-007 and cable from an old Lambda and the rest is home made. The main parts are made with files from Wachara (chinsettawong). Many thanks. 

    A lot more has to be done before it’s a decent headphone.

    Very nice!  

  21. Technical Assistance/Advice Thread

    in Do It Yourself

    Posted

    I believe the 580V Stax bias voltage with 5M ballast resistor is safe for HE90.  I have tried the HE90 with some Stax amps in the past, and I didn't notice any problem.  However, if it will make you feel better, reducing the bias voltage to 500V and adding additional 5M ballast resistor are the way to go.

    • Like 1
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