Need help with identifing rectifier bridge

[Mrgroovy]

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!

[Jon Snell]

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/

[Mrgroovy]

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?

[Jon Snell]

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.

[vintagekiki]

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)


_{When replacing, pay attention to layout of connection 1)}

[Mrgroovy]

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)

[ATTACH=CONFIG]57967[/ATTACH]
_{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.

[Jon Snell]

3A is a bit close for comfort but maybe OK. If they fail, at least you know what the issue is.

[vintagekiki]

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.

[Mrgroovy]

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

[Enzo]

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

[vintagekiki]

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