Dick Smith Q-1760 linear power supply filter capacitor question

[Agent24]

I have acquired a used Dick Smith Q-1760 power supply - although the OEM is Manson Industrial
It has at least one problem.

The voltage control potentiometer VR2, 50K is faulty - going high resistance / open circuit in the CCW end and leading to the output voltage jumping around.
I have already ordered a replacement potentiometer, so that's not an issue.

Now, I want to replace all three electrolytics on the PCB as they are CapXon and I don't trust them so much, I will replace them with something better while I've got the thing apart anyway.
All are CapXon GS - a general purpose series.

Two are simple - just filter capacitors for the +/- rails to the control circuitry and op-amp.
I can source general purpose Panasonic (M series) but the ripple current rating is somewhat lower.
I doubt this is an issue when powering an op-amp at milliamps, however.

But I am unsure of the output capacitor - C5 - a 470uF, 35v one.
The CapXon GS is rated about 750mA but the Panasonic M for the same size is 550mA.

I may be wrong, but I imagine the ripple current seen on this capacitor is not very high, given the bulk filter capacitor on the supply's input is a nice 10,000uF already
So I expect it's unlikely I need to meet the same ratings as the original, even if the PSU is delivering the full 5 Amps....
But, I feel like a higher quality one might be a good idea in this position, as I have seen posts about this and similar power supplies where this output capacitor is blown.

However, if higher RCR is good, I can only meet this with Low ESR capacitors with over double the RCR rating of the CapXon GS as I can source nothing else.
And of course these are much lower ESR than the originals, I'm sure.


My question is whether the feedback/regulation and overall stability of the supply would be altered with the use of a Low ESR capacitor?

[stj]

use something decent like Rubycon YXF, not baseline crap.
why would you want 2000hour lifespan caps?

[Agent24]

Figured there was no point, the lifespan will be longer since they won't be running anywhere near 85 degrees anyway, I imagine.

I don't think I can get YXF for all of them. I can get YXG and YXJ for some. Others the only good series I think are ZLH or others.

If Low ESR capacitors will not cause issues, then yes I could get them. Just wasn't sure if there might be problems, especially on the output.

[stj]

not sure, thats why i picked YXF, YXA may still be in production.

[Agent24]

Unfortunately the offerings at Farnell aren't so great these days, so I'll just have to see what I can get.

They have a decent range of Wurth Electronic and Vishay, Kemet etc capacitors but I don't know how great those are compared to Rubycon or Panasonic.

[stj]

i have not seen a wurth cap fail.
but they have not been around long yet.

[Agent24]

Me either but I have only been using their general purpose 105 degree ones in basic projects where they aren't going to be stressed anyway.
RS-Components does list their COO as China, so, if that means anything...