I've recently acquired a Shuttle XPC SN45G. Being an old Shuttle, it's littered with several types of OST capacitors, which would be 15 years old now and due for replacement even if they weren't complete garbage. Fortunately, it still POSTS, so hopefully I got to it in time.
I've seen these rightly referred to as cap bakers, so I figure why put electrolytics into such a harsh environment? May as well poly mod it.
I've mostly gotten the CPU VRM figured out, thanks to here and here, although suggestions are welcome. What I'm stuck on are the other capacitors. Most of the polymer caps that I'm finding have ESR values one or several orders of magnitude lower than the originals, especially for the RLPs. How safe is it to decrease the ESR for these, and how far can you go? The guy in this thread is replacing 1000uf 6.3v RLPs with Nichicon RL8s. Is that OK for my application ESR-wise?
Also, on a related note, I'm going to order a Shuttle SilentX PC40 250w power supply to replace the weedy 200-watter the system came with, and I'll need to recap it (with electrolytics, naturally!). Has anyone done one of these, and do you still have your notes? It would be nice to order everything for the board and the PSU at the same time, not to mention not having to chase down replacements for whatever junk caps are in it. (Heck, if someone has a 300w PC50 lying around, I'd gladly take it off your hands!)
Thanks!
Red - 6 x OST RLS 3300uf 10v 10x25mm - Nichicon RR5 1500uf 2.5v
Blue - 3 x OST RLX 1500uf 16v 10x20mm - Nichicon PLF 470uf 16v
Purple - 9 x OST RLX 1500uf 10v 10x16mm
Green - 10x OST RLP 1000uf 10v 8x13mm
I've seen these rightly referred to as cap bakers, so I figure why put electrolytics into such a harsh environment? May as well poly mod it.
I've mostly gotten the CPU VRM figured out, thanks to here and here, although suggestions are welcome. What I'm stuck on are the other capacitors. Most of the polymer caps that I'm finding have ESR values one or several orders of magnitude lower than the originals, especially for the RLPs. How safe is it to decrease the ESR for these, and how far can you go? The guy in this thread is replacing 1000uf 6.3v RLPs with Nichicon RL8s. Is that OK for my application ESR-wise?
Also, on a related note, I'm going to order a Shuttle SilentX PC40 250w power supply to replace the weedy 200-watter the system came with, and I'll need to recap it (with electrolytics, naturally!). Has anyone done one of these, and do you still have your notes? It would be nice to order everything for the board and the PSU at the same time, not to mention not having to chase down replacements for whatever junk caps are in it. (Heck, if someone has a 300w PC50 lying around, I'd gladly take it off your hands!)
Thanks!
Red - 6 x OST RLS 3300uf 10v 10x25mm - Nichicon RR5 1500uf 2.5v
Blue - 3 x OST RLX 1500uf 16v 10x20mm - Nichicon PLF 470uf 16v
Purple - 9 x OST RLX 1500uf 10v 10x16mm
Green - 10x OST RLP 1000uf 10v 8x13mm
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