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Thread: Resistors for N120 Network

  1. #1
    Member Vintage Nut's Avatar
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    Resistors for N120 Network

    I want to replace the nine resistors on a N120 network from a 120Ti (see photo). Are all nine resistors the same? Can I use the same Xicon resistor that Orange County used a few years back? If not, is there a list or diagram showing which resistors to use? Thanks.
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    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

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    In the pic you have at least one 10 ohm and one 1.2 ohm so they don't all appear to be the same value. Unsolder one end of each resistor and read the values on the other side. Installing them with the value side down is not something a production line would ever do so these are likely not original installs.

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    Found on the Google. YMMV
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    Quote Originally Posted by Riley Casey View Post
    In the pic you have at least one 10 ohm and one 1.2 ohm so they don't all appear to be the same value. Unsolder one end of each resistor and read the values on the other side. Installing them with the value side down is not something a production line would ever do so these are likely not original installs.
    Thanks for the diagram. Iím not sure, exactly, how to read it properly, but it looks like there are several different ohm-value resistors used. I pulled the woofers out of the 120Ti cabinets to look at the N120ís that are in them right now (which were purchased used a few years back). They both have one resistor that is 15ohm and all the rest no longer have anything printed on them.

    Iím not sure if all the resistors from the factory had print on them when new, but would assume they did. I purchased these 120Tiís new in 1989 and the N120 networks (one of them in the photo above) have never left my possession other than to have Orange County work on them. They only replace one resistor with the Xicon one. All the other resistors are factory. But, they have had some good usage over the years, so itís not surprising to me that they are all a little ďcookedĒ. Lol

    Thanks again.
    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

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    The solder job does not look "factory" as well as a lot of the resistors being upside down.
    From the looks of the one end resistor and dark look on the board under them I would guess
    the originals were heat damaged.

    A re-capping may not be a bad idea as well.

  6. #6
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    All four N120ís I have look the same. Here are the ones I purchased new.
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    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

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    Here are the two I purchased used a few years ago.
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    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

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    Here’s a photo of one posted by another board member.

    http://www.audioheritage.org/vbullet...f-to-the-120Ti

    I tried Googling for more photos, but all that comes up are photos of JBL N120 headphones.
    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

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    Quote Originally Posted by Vintage Nut View Post
    Hereís a photo of one posted by another board member.

    http://www.audioheritage.org/vbullet...f-to-the-120Ti

    I tried Googling for more photos, but all that comes up are photos of JBL N120 headphones.
    EDIT: Found this photo (not mine) on Google.
    Attached Images Attached Images  
    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

  10. #10
    Senior Member grumpy's Avatar
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    So...

    1) Happy New Year
    2) R values, Not all the same
    3) Diagram with values was kindly provided
    4) Pictures show obviously damaged/overheated parts

    Suggest taking the networks with the schematic diagrams to someone who can order the proper values, perhaps increasing the wattage of the leftmost resistors (could be R2 and R3? difficult to trace in the photo), as even the casing has broken and dropped off), install them for you, and verify the correct wiring/connections.

  11. #11
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    Thanks, Grumpy. Happy New Years to you as well.

    Good advice. Iíll find someone who can read the schematic for me. I think I can handle the soldering.

    The 120Tiís served me very well for over 20 years as near field monitors for CD listening. They do sound very good. Unfortunately, I also started using them to play along side with my drums, which required turning them up beyond where they are comfortable performing. Thatís when they began to get too hot. Theyíve since been moved back to the listening-only room. Iím trying to restore them for another 20 years or more of listening.

    Thanks again.
    Sony N55ES (2), E1000ESD, C85ES - JBL 120Ti | Onkyo TX-SR605 - JBL L830 (4), LC1 (1) | Dell - Pioneer SX-750 - JBL 4406

  12. #12
    Senior Member grumpy's Avatar
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    Main thing is that the schematic shows electrical connections -only-, not physical or location/placement.
    Also it gives no clue to keep track of which end of a component is which (unless, like an electrolytic cap, itís marked), so you have to keep track yourself. A highlighter (to show trace progress on the schematic) and a sharpie might help to keep track of component ends (maybe pencil in numbers on the schematic to indicates nodes where parts connect or are wired together).

    Someone looking over your shoulder, would certainly help.

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