Replacing Rubycon CE W with Rubycon YXF

[Y. Signal]

Hello. I'm looking for the best modern long-life replacement for Rubycon CE W capacitors found in some old consoles and computers (Sega Genesis/Mega Drive and ZX Spectrum). In these machines I've also found (and replaced) Nichicon VX(M), TK C-8Z1 and FDS K002.

I've used Panasonic FR (and Rubycon YXJ for the 1 uF 50V) but the Sega Mega Drive became unstable after one hour of use, so I switched to Panasonic FC / Rubycon ML and it works apparently fine. I need more capacitors, so I'm planning to order Rubycon YXF instead of ML this time, is it a good idea?

ML does not especify impedance value. This is the maximum impedance at 20C specified in the datasheet for the values I need, so I have:

YXF 220 uF 16V: 0.25 ohm
YXF 100 uF 16V 0.4 ohm
YXF 47 uF 25V: 0.9 ohm
YXF 10 uF 50V: 1.5 ohm
YXF 1 uF 50V: 4 ohm

FC 220 uF 16V: 0.117 ohm
FC 100 uF 16V: 0.35 ohm
FC 47 uF 25 V: 0.8 ohm
FC 10 uF 50V: 1.3 ohm

So I suppose the YXF will do. FR 220 uF 16V has an impedance of 0.13 ohm, can I safely assume it's safe to replace a FC 220 uF 16V (0.117 ohm) with it in this application?

Or is it better to just stick to ML's that are more similar to the old capacitors?

[japlytic]

Re: Replacing Rubycon CE W with Rubycon YXF

From what I see, general purpose units are suitable for this application since the aforementioned units use a linear (non switching) power supply.

[Behemot]

Re: Replacing Rubycon CE W with Rubycon YXF

Yep, GP caps, not low-ESR. Maybe, just maybe some long-life will do. Like Chemi-Cons LE.

[Y. Signal]

Re: Replacing Rubycon CE W with Rubycon YXF

Thanks for the information. Yesterday I ordered some YXF to test.

Apart from Low ESR, Rubycon YXF capacitors are listed as Long Life / General Purpose in the catalog: http://www.rubycon.co.jp/en/catalog/capacitors.html

[Y. Signal]

Re: Replacing Rubycon CE W with Rubycon YXF

I've recapped a Sega Mega Drive using Rubycon YXF and apparently it's working fine since 2.5+ hours

I observed discoloration near a Rubycon CE W capacitor leg, does it look like electrolyte leak? the board is dated 1992.

[mockingbird]

Re: Replacing Rubycon CE W with Rubycon YXF

From what I see, general purpose units are suitable for this application since the aforementioned units use a linear (non switching) power supply.

What's wrong with using a Low-ESR cap after the bridge rectifier on a linear power supply?