Info or datasheet needed for an M4B51 bridge rectifier

[Pioneer621]

Hello,
I have a quick question on a bridge rectifier I found in my junk box. First a little info on what I need it for; I am working on an ampeg SVT-100T solid state guitar or PA type amplifier & the bridge rectifier in the power supply is shorted & needs replaced. (I hope I’m in the right forum with this question, if not maybe a moderator could move it to the correct forum)

Here is the bridge rectifier I have in my junk box that I need info on, I searched yahoo & google as well as any of the free datasheet websites I know of & could not seem to locate a datasheet for it, so I am not for sure on the voltage & current ratings of it & hoping someone here can help me out on that.

The bridge rectifier in question has M4B51 on it, then right under that has 7158. I can upload a photo of it if needed.

It looks similar in size to the one I need to replace (maybe even a little bigger) only the one out of my parts box has a heat sink around it, I can make it fit no problem, just need to know the voltage & current ratings for it, I did some quick testing with it & it worked in there & seemed to stay cool, but since I am unsure of the maximum voltage of it I did not test long.

I can order a replacement for the amp if needed, but if this one I had in my junk box has sufficient ratings I will use that instead. I will keep digging through my parts boxes & see if I can find anymore rectifiers, while I’m doing that I hope someone here has some info on the M4B51 bridge rectifier.

Thank you all for your time & hope to here some info on the rectifier! Take care! Pioneer621

[jaycee]

If there's space, simply put a GBPCW type rectifier in there. A 400V 35A one should be overkill.

[Pioneer621]

jaycee,

Thank you so much for the fast reply! Well, before I seen your reply the only bridge rectifier I could find that was remotely strong enough, was in a home made 12v power supply I was building a couple years back, it was a 200v 25A (MB252). It was a little too big to fit in the old rectifiers location so I mounted it on the opposite side of that one & ran small jumper wires to it, it worked fine & I don’t think it should have any problems with that one in there.

From the datasheet I found on the original bridge rectifier that had blown indicated it as a 200v 6A maybe it was 7 amp, one of the two, was not very big either way.

I think the one I installed in its place should be ok. But the 400v 35A one you suggested would have been a better choice if I had one on hand. I did not want to order one or go to the store to buy one, so was hoping I could find something around here that would be suitable & I think I did.

It would have been nice to have one that fit in the original location, but installing a higher rated / larger part never hurts if you can fit it in there.

I guess we can leave this post up incase someone out there may have the datasheet for the M4B51 bridge rectifier, although I ended up using something else, knowing the specs on it would be nice for future projects, of course bridge rectifiers are not too expensive so not a big deal, I mainly use it on lower voltage projects anyhow.

Again, thank you for the information & the amp is back to life! Thanks again & take care!