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headinclouds

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Posts posted by headinclouds

  1. I would like to have two more pairs of the individual GR LV boards and can also see them being useful in a few other projects.  These are the small single boards 3.75" x 2.4"  (95 x 61mm).

    I will be buying some (from England) and if you want to get on a mini buy please let me know.  I am away next week so will place an order in early June. The price would be starting at $16 each and come down a bit if the order quantity goes up.  (plus postage and pp fee).

    Please pm me if interested.

    Edit - to explain.  I am based in England so that is where I am placing orders and shipping from. (and yes my first language is English!)

    Same arrangement and supplier as for the KGST GB I did.

     

    UPDATE; 7 June:  I'm ready to order.  The price is $24 for a pair of latest GR LV boards. Postage and paypal fee to add.

    pm me if you want any.

    UPDATE; 7 June:  I'm ready to order.  The price is around  $20 for a pair of latest GR LV boards. Postage and paypal fee to add.

    YES $20 per pair now.  pm me if you want any.

     

     

     

     

     

     

     

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  2. Yes on the sound quality I think it is a very fine amplifier.  Clean, fast, detailed, neutral etc.  I noticed that it was very stable in respect to temperature.  (The breadboard did use the full final heatsinks).  It would come up to temp and then the offset/ balance would not change much for hours.  I did not engage the servo.  I tried a version with and without the cascode current sources but didn't carry out detailed listening comparisons.  I also ran 10mA to 20mA and was perfectly happy with the 20mA performance.

  3. That's good work Joamat.  A fine example to us.

    and Kerry great stuff, are you doing that on your own milling machine?  One of the "rules" I adopted from the outset was no screws should show on the front panel.

    It is a costly process and requires heavy material but looks good.

  4. 21 hours ago, johnwmclean said:

    Geoff, I’ve not heard anything yet. Will be interesting when I do, I have a KGSSHV, BHSE and DIYT2 for comparison :P.

    Excellent! It will be good to hear your views on it.    I had a breadboard running a few months ago and sadly had to clear it off the desk after a couple of weeks.  It was very nice while it lasted.   I am looking forward to the proper build - my 007 Mk1 seemed to like it and since then I have also an L700.

  5. 4 hours ago, Craig Sawyers said:

    Depends.  I used big Fischer heatsinks on my power amps, and the mounting face was pretty banana shaped - actually fairly typical of big section extrusions.  Took quite a bit of work to level them (all 8!) - abrasive paper taped to a glass plate.  But in fairness to Fisher, they say that if surface flatness is important they should be machined flat (which they offer to do - for an undisclosed price).

    But polishing isn't really necessary - heat sink goop fills in minor surface irregularity.

    But I did not flatten my T2 heatsinks, and have not had any problems.

    Very true - they certainly are banana shaped.  When I made my first cases I decided to bolt a 1inch square bar (bit OTT) to the heatsink and tap that vertically downwards to hold the transistors.

    When I got the heatsinks and bar neither was flat enough so I machined a quick skim over the heatsink and the bar to get flat mating surfaces.  But even having access to a milling machine doesn't totally solve the problem if the parts are not clamped correctly they'll bend and still not be flat after machining.

    mahined HS.jpg

    P.S John, your fellow Australian has some useful info on all this in case you hadn't come across it.   http://sound.westhost.com/heatsinks.htm

    • Like 1
  6. 6 hours ago, spritzer said:

    The instruction manuals have always stated that though it was something like 90% but non condensing.  Change the humidity and you change the breakdown voltage of the air dramatically.  Normally it is around 100V/mill so the drivers are setup around that though with plenty of headroom. 

    I don't think humidity is the culprit in the recent driver failing though.  It might contribute due to its effect on static charges and stuff like that but at the end of the day the drivers just aren't stable.  Being able to restore them to full operation by hitting them is a giant red flag to this fact. 

    Yes thanks Birgir, that was what I was looking for.  So possibly the large diaphragm and small spacing is more prone to this.

  7. Hello Fred,

    Yes the beginning of my Stax adventure.   On cases I can help easier with a design than I can with parts, I've been waiting 6 weeks for the front panels for my Carbons to be done.

    The guy gives precedence to his industrial customers.  I'd do them myself but they are too big for our cnc mill.

    I'll pm you

  8. Been pondering this issue of problems with the SR-009 (mainly and possibly a few 007).

    I have just acquired a new L700 and the instructions say "avoid using earspeaker in a hot and humid conditions", without any specific guidance.

    Well I wouldn't use them in the bath, but all my listening is done in England where the rooms are about 20c (68F) and dry.  I have never had a problem with my Staxes.

    What is considered opinion of what is too hot and humid for Stax ES?  

    And by inference any possible connection with problems people are having?

    • Like 1
  9. I applaud Sennheiser for producing this advance in ES technology.  Ceramic stators etc  The inclusion of the output stage in the cups is a nice idea.

    But just speculating; even allowing for the halving of capacitance by eliminating the cable, and possibly a particularly efficient driver, surely some 6w or so (just as a quick guess) must be needed in each earpiece.

    A heat and weight issue.  But the words “Cool Class A” suggest it is not true Class A at all times, hence reduced dissipation. The quoted distortion figure is nevertheless impressive.

  10. It is done by an engraver literally a mile from my house.  He does tons of cups and trophies for schools and sports clubs, and labels and warning signs etc.

    He also has a little milling machine with an old pc that does a limited range of fonts which he uses on my engraved panels.  You might be able to find somebody doing similar work.

  11. the case is from taobao, the Chinese version of ebay.  they even  cut a stepped hole for me for the stax socket

    http://world.taobao.com/item/39957531066.htm?fromSite=main&spm=a312a.7700846.0.0.Fa8iz2&_u=421pt7g7143

    That's amazing!  and shocking too considering the cost of such things in Europe. These are no doubt made in quantity, but a bespoke case made here (such as this) would be ten times the price.  My heatsinks were more meaty though

    psXUsT0.jpg

    • Like 2
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