Others in this thread have offered you a wealth of technical information that I need not repeat. Suffice it to say, your reason to post here all boils down to your need to replace caps on your SE/30 logic board. No doubt you are inclined to replace only those which you physical see leaking. But I would advise you to replace them all.
Yes, I have replaced all the caps on two different logic boards in the past. It's worth doing. Why? Because many of the caps have leaked, even if you cannot see it. They all have aged too, so they all really do need replacing. That's the only way to be sure a system crash now and then is not being caused by a cap you neglected to replace.
I used electrolytics on one of my boards and tantalums on another. Both boards function the same, for now. But Tants will give you longer life. Indeed, the tants will keep going even 25 years hence. Electrolytics will leak at some point (although it make take more than 15 years for that to happen).
You will find that you cannot replace the biggest two caps with Tants, simply because they don't make tants that big. So use electrolytic for those. I would also suggest that you find the exact capacitance size, as it's not that hard to do so. Voltage doesn't matter at all, so long as your replacements are the same or higher voltage that the one's you're replacing.
So long as you have the right soldering tools and the right replacement caps, it's not really that hard a job. (And if you want to read more about capacitor replacement on older compact Macs, this thread may be enlightening.)
Yes, I have replaced all the caps on two different logic boards in the past. It's worth doing. Why? Because many of the caps have leaked, even if you cannot see it. They all have aged too, so they all really do need replacing. That's the only way to be sure a system crash now and then is not being caused by a cap you neglected to replace.
I used electrolytics on one of my boards and tantalums on another. Both boards function the same, for now. But Tants will give you longer life. Indeed, the tants will keep going even 25 years hence. Electrolytics will leak at some point (although it make take more than 15 years for that to happen).
You will find that you cannot replace the biggest two caps with Tants, simply because they don't make tants that big. So use electrolytic for those. I would also suggest that you find the exact capacitance size, as it's not that hard to do so. Voltage doesn't matter at all, so long as your replacements are the same or higher voltage that the one's you're replacing.
So long as you have the right soldering tools and the right replacement caps, it's not really that hard a job. (And if you want to read more about capacitor replacement on older compact Macs, this thread may be enlightening.)