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Thread: Building biased 250Ti networks

  1. #16
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    Quote Originally Posted by Jakob
    Giskard,

    Am I right in assuming You are building a pair of biased networks for your 250ti´s? If that is the case, will you continue to post your progress in this thread with a lot of pictures and step by step information regarding the building? I would appreciate that a lot, and I think other 250 owners would as well.

    B.R!
    Things just didn't work out quite like I had envisioned. I did get a few pictures but then my digital went analog and that was the end of the photo shoot.

    A picture of the double tiered masonite boards and the 250Ti back template. I ended up going with 1" standoffs instead of 2". I also ended up mounting alot of the components on top the second tier instead of sandwiched between the tiers.
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  2. #17
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    Rustoleum paint - hammered finish
    I believe these are the original 1/4" taps for the bus bars.
    I think I ended up going with 1/2".
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  3. #18
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    Front and back of boards.
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  4. #19
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    The rest of the pictures are courtesy of jblnut.

    Inside of L250 with stock network again:
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  5. #20
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    Inside of L250 with biased 250Ti network.
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  6. #21
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    Low pass section separated out.
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  7. #22
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    Side view showing extensive resistor pads. Bias resistors are mounted on the underneath of the second tier and can't be seen without taking the tiers apart.
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  8. #23
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    Back view installed. Battery not hooked up yet. That hammered finish is shiny!

    Those bus bars are all level, they just don't look like it in the picture.
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  9. #24
    Administrator Mr. Widget's Avatar
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    Beautiful work!!!!

    Widget

  10. #25
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    Excellent Craftsmanship. The bends look like they were made with a tubing bender. The added insulation is a Nice touch. The layout looks CNC. Positive connections, blah I don't have to tell you, as you know already, but I must say: Attention to detail is the difference between superiority and mediocrity. Those are super. I'm a tradesman (tool/die/mold maker) and have worked with/along various trades. Your work displays many skills. Thanks for taking the time to share.

  11. #26
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    Thank you!

  12. #27
    Regis
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    You came through again...

    With a great writeup, excellent before-and-after pics and just superb craftsmanship. The new networks look like they'd blow away the old ones. The crossovers do make a diff and I'm looking forward to a test of what the new sounds like vs. the old.

    Thanks!

  13. #28
    Regis
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    What's the battery for?

    Gotta ask. Reviewed the pics again and there was a 9V battery there! What does it do? Inquiring minds wanna know!

  14. #29
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    Hi Regis,

    The battery charges the capacitors. You can read about it here - Bypassed and Biased Capacitors in the biased portion of the thread.

  15. #30
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    Hi Regis,

    The thread that has the reviews and the history behind this whole project is below. I started the thread two years ago and it's officially done (for me at least) now. As you can see, I did finally relent and decide to pursue upgrades although I was very happy with the L250's as they were.
    And the solution was - as Giskard predicted - charge coupled networks. Custom, bi-wireable, adjustable charge-coupled networks actually ...

    http://www.audioheritage.org/vbullet...read.php?t=289

    jblnut


    Quote Originally Posted by Regis
    With a great writeup, excellent before-and-after pics and just superb craftsmanship. The new networks look like they'd blow away the old ones. The crossovers do make a diff and I'm looking forward to a test of what the new sounds like vs. the old.

    Thanks!

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