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Thread: ECM8000 Mods

  1. #31
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    Some of us really wish we had that techie talent as you guys. This is fun and interesting stuff to read..keep posting fellas.

  2. #32
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    Originally posted by Marik
    Roybot, I ordered those just yesterday from Digikey. Yes, the capsules are discontinued, but Digikey still has over 3000 in stock. 61s have lower noise, so it would be worth to try. With Linkwitz mod they will have about 134 db SPL and with higher PSU voltage, even more. I am not sure, but I have a feeling that the 61s use a different from 60s, lower noise FET. When I get them I'll gut a couple of these guy.
    Hmmm.. that's interesting! Just 3 days ago I checked and there were 0 WM60-AY's and 8000 -AT's. Now there's
    3000 -AY and 10600 -AT's.. guess Digikey got a last shipment?? They also bumped up there -61's too, even more of those. So, they're not unavailable yet!

    I'd be very interested to know how to open and change FET's.. assuming it's not a wreck 4 out of 5 capsule prospect!
    What do they have in there, a SMT part?

    <Out of desperation, I came up with a good way to ground capsules modded for 3-wire Linkwitz or phase-splitter use.
    Basically it's a carefully bent paper clip. It can also double as part of a mounting system as shown above.>

    Dayvel, it is a cool solution. However, aluminum is prone to oxidation, so on the long run it wouldn't be very safe.
    Yep, Aluminum does get that insulating surface layer of oxide... I like hearing about using Asprin as a flux.. I'll have to try that! Securely soldering a ground wire woud solve the probelm, but another way may be to use an anti-oxidant grease on the joint. You can find the stuff in electrical stores, "No-ALOX" and other brand names. You need to sand or something to clean metal while applying this, it prevents the oxide from reforming, seals the joint and really lowers resistance. If done right, it could make a pretty good permanent contact.

    Jon, welcome. I don't think you can find something cheaper than already dirt cheap ECM8000. As it is, it might be too noisy, but let's see if we can overcome it...
    Well, a $2.50 mic capsule and home make the rest of the body would do it.. assuming the Behrenger is pretty much the same as Linkwitz' example with a preamp on board.. It will be interesting to find out if a lot of the noise of the ECM8000 is from the inboard amp rather than the cartridge, or if the cartridge is the majority.

    A note.. Sigfried is getting too popular, he's beginning to bump up against his bandwith limits, and is starting to take down some of the stuff on his site. Cant say I blame him, bandwidth isn't cheap, but it's too bad for the site as a reference. Either buy his disk of all site info, or take a trip to the wayback machine..

    <No skepticism here. I just wasn’t clear whether you were going to do the Linkwitz mod or try and swap the FET in the capsule.>

    Both Flatpicker, both...
    And then, see which one is better.
    Yeah, I couldn't find the graphs for ATs either, so I just ordered more expencive AYs.
    I've never seen any graph different for the WM60 family.. that implies they are just selected for sensitivity and put in catagories.

    Will be interesting to hear the results..

  3. #33
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    I just ordered a handul of WM-60AY's and now there are less than 100 available. Who's buying these things and if Digi-key is selling almost 3000 of them in a day why are they being discontinued? BTW - when I received the email from Digi-key about this becoming an obselete part, there were none available.
    So I'm as curious as JonPike about where the latest 3000 came from. Marik, thanks for the heads-up!

  4. #34
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    I just ordered a handful of WM-60AY's and now there are less than 100 available. Who's buying these things and if Digi-key is selling almost 3000 of them in a day why are they being discontinued? BTW - when I received the email from Digi-key about this becoming an obselete part, there were none available.
    So I'm as curious as JonPike about where the latest 3000 came from. Marik, thanks for the heads-up!

  5. #35
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    Well, Panasonic could still have a ton of stock, even if they are stopping production.

    It's common (or at least desirable for the customer) to announce a product's termination well in advance of the event, so they have time to change designs for new, available parts. I think the note said they were stopping production in May?

    Remember these parts are normally made by the 10,000's or 100,000's a month, and usually bought by companies that may produce up to similar numbers of their product. Think Uniden or Panasonic and how many new model answering machines needing a little mic capsule they probably crank out a month..

    Us little guys, small buisnesss buyng a few hundred, designers puting together new products buying a few tens, and crazy diyers buying a few at a time tend to be a minority in the industry.

    I hope there will be a few more buys.. and hope the missing 2900 wasn't some misguided bozo thinking he'll keep them then sell on Ebay for $10-20 each. ;-) More than likely it was some manufacturer buying a chunk of stock to put off having an engineer go mic shoppning.

  6. #36
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    OK,

    Time for update. Last hight I rebuilt the first stage of the preamp. I made it as a cascode FET, eliminating the first coupling SM capacitor. I tryed two versions--with fixed and self bias. The later sounds better to me. However folks, I've got a problem--the sensitivity is about 5-6db lower than the stock one. Can we live with that?
    I am waiting for shipping from Digikey and see if I will be able to replace WM60's FET with selected for high trunsconductace one, so it might take care of the problem. Later tonight I will post some pictures.

  7. #37
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    Here is the stock ECM8000 schematics. Sorry, it is not finished yet, but will give an idea. The output transistors are monolitic 2SA1349.
    Attached Thumbnails Attached Thumbnails ecm8000-circuit-jpg  

  8. #38
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    Just undressed:
    Attached Thumbnails Attached Thumbnails ecm8000inside1-jpg  

  9. #39
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    Here is a stock PCB:
    Attached Thumbnails Attached Thumbnails ecm8000pcbstock-jpg  

  10. #40
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    Gutting has started:
    Attached Thumbnails Attached Thumbnails ecm8000gutting-jpg  

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