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Thread: Need help with identifing rectifier bridge

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    Need help with identifing rectifier bridge

    Hi all, first post here.

    I have an old solid state amp (Ibanez GX30) with a broken rectifier bridge. I am unsure which part to replace it with. It reads "RB 15 2 24A". Incidently, I have two of these amps and the other amp which is working properly has a different partnumber for the rectifier bridge, (RB 15 2 29C), if that can be any help in identifying a working spare part. The AC connectors are placed at the far ends and not in the middle as most modern parts I've seen. I guess I can build a RB with 4 diodes if someone could help me choose diodes with the correct value for this type of rectifier.

    PS: Is there any way to post images here? Edit: uploaded images to Dropbox URL.

    https://www.dropbox.com/s/0d3aa4x0ld...2024A.jpg?dl=0
    https://www.dropbox.com/s/otik012377...2029C.jpg?dl=0


    Thanks!

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    Last edited by Mrgroovy; 04-10-2020 at 09:41 AM. Reason: Upload images url

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    Member Jon Snell's Avatar
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    Unfortunately they no longer produce a bridge with that exact pin out. The outer pins are the DC side now so if you fitted a standard bridge the pins will need carefully re forming into shape. This will give you the idea.
    https://uk.rs-online.com/web/p/bridg...fiers/7514436/
    Or use four 5A diodes and form them into a bridge with the correct pin out to fit the board.
    https://uk.rs-online.com/web/p/recti...iodes/7815616/

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    Last edited by Jon Snell; 04-10-2020 at 10:20 AM. Reason: More information
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    Quote Originally Posted by Jon Snell View Post
    Unfortunately they no longer produce a bridge with that exact pin out. The outer pins are the DC side now so if you fitted a standard bridge the pins will need carefully re forming into shape. This will give you the idea.
    https://uk.rs-online.com/web/p/bridg...fiers/7514436/
    Or use four 5A diodes and form them into a bridge with the correct pin out to fit the board.
    https://uk.rs-online.com/web/p/recti...iodes/7815616/
    Thanks Jon,
    I happen to have 4 pcs of 6A6 rectifier diodes, they're 6A 600V right? Will they suffice to build a working RB, you think?

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    Member Jon Snell's Avatar
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    6A is sufficient to run the amplifier I should think.
    Before you solder the diodes together, have a go at forming them to fit the pcb holes. Once soldered it is difficult to move them if there is a mistake. Leave long legs for cooling.
    Good luck.

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    Senior Member vintagekiki's Avatar
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    https://elektrotanya.com/ibanez_gx30_combo_sch.gif/download.html#dl
    Ibanez GX30 schematics

    rectifier bridge from schematic D108 = RB-152

    http://pdf.datasheetcatalog.com/datasheet/eic/RB150.pdf
    RB152 Silicon bridge rectifier (200V/ 1.5A)

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    When replacing, pay attention to layout of connection 1)

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    Last edited by vintagekiki; 04-10-2020 at 12:04 PM. Reason: 1)
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    Quote Originally Posted by vintagekiki View Post
    https://elektrotanya.com/ibanez_gx30_combo_sch.gif/download.html#dl
    Ibanez GX30 schematics

    rectifier bridge from schematic D108 = RB-152

    http://pdf.datasheetcatalog.com/datasheet/eic/RB150.pdf
    RB152 Silicon bridge rectifier (200V/ 1.5A)

    Name:  ! Reminder.gif
Views: 62
Size:  206 Bytes
    When replacing, pay attention to layout of connection 1)
    Thanks for helping me out. I have a bunch of 1N5408 diodes too, they are 3A 1000V. Could I use those instead of the 6A6? They are a bit smaller and probably easier to fit than the latter.

    Thanks.

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    Member Jon Snell's Avatar
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    3A is a bit close for comfort but maybe OK. If they fail, at least you know what the issue is.

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    Senior Member vintagekiki's Avatar
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    Quote Originally Posted by Mrgroovy View Post
    I have a bunch of 1N5408 diodes too, they are 3A 1000V. Could I use those instead of the 6A6? They are a bit smaller and probably easier to fit than the latter.
    Yes you can use 1N5408 diodes, only carefully polarize them.

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    Quote Originally Posted by vintagekiki View Post
    Yes you can use 1N5408 diodes, only carefully polarize them.
    Thanks, I will be careful!

    While doing some more troubleshooting, it seems I found a blown transistor too. Can't seem to find a part that matches this one excactly but will any D667 type of transistor work you think? Attached is a photo of it.

    https://www.dropbox.com/s/cb4q5oqdm0...03932.jpg?dl=0

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    There is an understood 2S there, so the part is a 2SD667.

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    Senior Member vintagekiki's Avatar
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    Quote Originally Posted by Mrgroovy View Post
    While doing some more troubleshooting, it seems I found a blown transistor too. Can't seem to find a part that matches this one excactly but will any D667 type of transistor work you think?
    Transistor Q109 (2S)D667 is universal NPN low power transistor 80V/ 1W.
    When replacing, pay attention to correct Pin configuration (Pinout)

    https://www.el-component.com/bipolar-transistors/2sd667

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