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federicopol

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About federicopol

  • Rank
    Newbie

Profile Information

  • Location
    Italy
  • Interests
    Diy
    Stax headphones

Converted

  • Headphones
    Stax SR-202, Stax Sigma normal bias, Diy 80mm driver electrostatic, Diy magnetoplanar headphone (Vintage Tds16 drivers)
  • Headphone Amps
    Stax Sra-12S, Stax Srm-252s, Diy cMoy
  1. federicopol

    The Headcase Stax thread

    Hello, while i wait for some parts for restoring my sra12s i made some new earpads for my sigmas. I also made the internal dampening. Following the advice of Spritzer i used the most dense material i could find. By pure luck the material and quantities i used seems to be ok. The soundstage seems here, definitely the best of the headphones i own. The bass is present and clear so i am pretty happy of the final result. I decided to substitute the earpads because i don't feel comfortable using earpads that have been used by someone else for 30 years... I decided to not use a spare pair of lambda earpads because of the different shape of the lower back part. I made them in leather following the procedure Stax (or their supplier) probably used. I used an embroidery machine to sew the ear oval on the reverse side of fabrics, then i reversed the fabrics. With the fabrics now on the right side i added some low heigh memory foam cutted a couple of mm smaller than the finished earpad. Now i used the embroidery machine to close the earpads. Cutted the excess leather and here they are. They are a bit bigger than the original ones and are less stuffed, nothing dramatical but i will remade them the next time i have time to use the embroidery machine. The same method can be used to make them with a sewing machine for the oval and an overlock machine using 3 threads and a short lenght stitch.
  2. federicopol

    The Headcase Stax thread

    Thank you very much, i'll remove them and try with something dense. By the way in my sra12s i have a +640V rail on the PS that feeds the amplifer board. Using that 640v point and a 2 resistors voltage divider to create the pro bias voltage is the normal way to do that? Ir therebis a better way? Thank you very much and sorry for the newbie requests...
  3. federicopol

    The Headcase Stax thread

    Hello, i am new here and since the Mafia reside here... i'm gonna ask for a help to the Padrino or some of his associates.... I recently bought a sra-12s that needs some love (a recap, a pot cleaning and an adding of a pro bias out), i got a discount on the original asking price and i got gifted a pair of stax sigma Normal bias ("because i don't know what to do with them if i sell the amplifier"). The Sigma are really ok, the drivers are ok, they simply need a cleaning AND a new damping because the original glass wool dampening have been removed. My question is: What can i use for remake the dampening? (I llan to use quilt batting, is that ok?) What shape the dampening should have? (Should i cover all the planes except the driver one, am i right?) And there seems to be a pair of resistor attached to the cable connecting the driver, are they normal? Thank you very much.
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