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About Laowei

  • Rank
    Limited Edition Bronze Participant
  • Birthday 06/07/1957

Profile Information

  • Gender
  • Location
    Vancouver, WA USA


  • Headphones
    Stax SR-009, SR-L700, SR-007mk2, SR-207, SR-003mk2
  • Headphone Amps
    KGST, KGSSHV Carbon -in process
  • Sources
    Mac mini > Airport Express> microRendu > Schiit Yggdrasil
  • Other Audio Gear
    DIY PP 6V6 amplifier. ALTEC Model 19 speakers. ALTEC 809C Bolero speakers modified with vintage Great Heil AMT

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  1. Are you planning to just carry the main STAX product line, or will you also be including accessories and service/repairs too?
  2. I'm pretty sure that riveting was done there simply to reduce assembly cost. The rivet is so damned small, it loses the mechanical integrity of the rivet bond when heated soldering the bias wire to it. Not enough to fully break contact and cause an obvious failure on manufacture. Could possibly cause intermittent problems after time and handling as folks have written about on the forums. All anecdotal on my part.
  3. Replaced the cable in my SR-009 yesterday. They are playing great now. When soldering the wires to the stator and diaphragm tabs, I came across some details that I thought should be passed on. Desoldering all the wires and removing the old cable was not a problem. See the "Ants in My Stax" thread for 009 disassembly. Remove all the plastic parts mounting the cable to the ear pod, don't try to desolder the wires/cable with these in place -no room. On reassembly, first note orientation of the cable for each ear pod, The arrow on one side of the molded strain relief is to be assembled on the inside only (ear side) and will help ensure signal polarity between L&R channels. Soldering the +/- signal wires to the stator tabs was straightforward. Where it got interesting was when I went to solder the pro bias wires to the diaphragm tabs. The diaphragm solder tabs on my SR-009 are a small additional part that had been riveted to the actual diaphagm. The right side rivet was well attached and the wire/tab easily soldered. But the left side rivet was loose and the tab rotated wildly when I touched it with my solder tip. Took some doing, but got it soldered. Then to double check when done, I measured the continuity of each wire from solder tab to cable pin. All measured 0.01 ohm, except the left bias wire. That measured ~25 ohms and varied wildly as the tab was minimally rotated. I then attempted to solder the bias wire to the diaphragm directly, but did not want to heat too much and possible melt it. Also, the material did not take to solder (probably aluminum?) and so the reason for the riveted solder tab. I finally resorted to adding a blob of solder (with the bias wire) on the tab, and rotating until the tab wedged tight under the diaphragm. That ended up also measuring 0.01 ohm and was stable with the cable assembled. Powering up the headphones, I noticed that both L and R channels started playing at nearly the same time. Previously, the L channel took several seconds longer to start playing, and usually had a sllght and wandering imbalance with the R channel for the first 1/2 hour or so. I took that as amp warm up (KGST), as things settled in nicely after that time. Now, the central image is rock stable from the start up, and the soundstage is balanced and huge. Got me thinking that loose rivets may be a cause of imbalance in some SR-009s, and takes longer to fully charge? My 009s are around 3 years old. I did not take photos while I was working on them, but attached detailed photos from the "Ants in My Stax" thread from 2012. In those earlier headphones, Stax is seen to have used a screw and nut to assemble the solder tab to the central diaphragm. Later versions like mine were "cost reduced" to rivet that connection. When that changed over in production, I do not know. I could image the intermittent coming and going of stereo balance problems written about, may be due to a loose rivet and random cable handling. That might be something others with SR-009 channel imbalance issues may want to check out. Earside view (note arrow), circa 2012: Opposite view, circa 2012:
  4. HS can be the Head Case dumpster diver.
  5. We'll have to wait to find out.
  6. Finally received my replacement SR-009 cable from STAX Japan and their shipper A&M Enterprises. All looks good and will be soldering it in a few days. Talking via email with Douglas Ip of STAX, he mentioned that as of Jan 1, 2017 Yama Enterprises is no longer their STAX distributor/dealer here. Douglas is working now to establish a company and warehouse out of Dallas/Fort Worth Texas. Great news.
  7. I got a pair of SR-009 earpads from STAX USA for $350 several years ago.
  8. Hopefully the info on my runaround might help some others here.
  9. Finally found some resolution. STAX USA never replied to several calls and emails over 3 weeks. What a fuckhead, as I had bought a SR-007 Mk2 from Yamas earlier. ElectroMod did not reply to one email sent. A forum member here wrote to me that Mark there might be on vacation, so I continued to look elsewhere.. ECT out of Hong Kong replied and after much back and forth, Audrey there told me that they could not sell the cable separately. They are still out on the long CNY/Spring Festival holiday there, so nothing more to report. So I contacted the Canadian STAX dealer, Plurison in Monteal. Great response and communication. After supplying them some requested info (where bought and serial number) and also supplying a video showing where the cable was shorting with a DVM, they contacted STAX in Japan, received a quote back and arranged A&M Enterprise LTD (handles all STAX export shipments to dealers) to drop ship me a replacement cable from STAX Japan. FOB cost of the cable was JPY28700 (~$254), EMS shipping was JPY2900 (~$26). I forgot how archaic doing business was with Japanese companies..... requiring a bank transfer. $40 added to send and another $40 to receive on their end. Argh! Luckily I did not have to FAX them the info. As of today, A&M has received the money, will ship and forward the tracking number as soon they get the cable from the factory. So probably have the cable in hand in a week or so. I can highly recommend Douglas Ip at Plurison. Had a first rate experience in dealing with him. Straight forward and no bullshit.
  10. I also contacted ECT (STAX dealer) in Hong Kong. I travel thru there often for work and bought a replacement arc for my SR-009s from them a couple of years ago for cheap.
  11. Emails sent to Yama and Electromod..... will report back if I get a reply from either.
  12. Thanks! Found that thread here: Disassembled the left channel, and found that the cable inside the molded strain relief was measuring open when wiggled. Will order a new cable.
  13. OT. Tyll recently found these new AMT headphones at the CES. Looks promising, and a lot more aesthetically mainstream:
  14. Recently my SR-009 has developed an intermittent drop out in the left channel. It comes and goes when I wiggle the cable about 1/2 inch below the earpod connector. I am planning to open it up and check the cable for continuity and if OK, will resolder the internal connections. If not I will replace the cable. My only previous experience with disassembling the SR-009 involved only changing out the earpads. The first question I have is this something I can DIY on my workbench? Or is a clean room required to properly service, requiring these to be shipped to a STAX service center? Any weird quirks when working on these headphones, or will it be pretty straight forward?
  15. LSK489 and LSJ689 are the n-channel and p-channel FET duals respectively. Reverse taper wired as you described would work with linear taper pots. Not log.