Re: Replacement for the Siemens Bakelite caps in an early 1980s SMPS
Yes the machine was made in 1982. I'm impressed with those Siemens caps. Other caps with Bakelite housing (Roedersteins) were also fine and went back in for lack of replacements. Found a Frako NO 10ยต/63V that aged way worse measuring 140 Ohms ESR.
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Re: Replacement for the Siemens Bakelite caps in an early 1980s SMPS
I suspect they may be some sort of OEM production for Siemens by Roederstein. The rather unique casing, marking, etc all look like they came from the same production line with just the logo stencil swapped. But I can't know for sure.
Pin spacing is 5mm. Dimensions I have to guess right now. Something like 16x35mm.
Thanks. EKCs specs look similar to other current day low ESR caps.
That's good news so I don't have to worry...Last edited by rewease; 09-17-2023, 01:18 PM.
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Replacement for the Siemens Bakelite caps in an early 1980s SMPS
Hi everyone,
There actually was a time when early SMPS and late bakelite housed electrolytic caps coexisted in high end industrial gear. A friend of mine just got himself a CNC milling machine form that time with its first set of now 41 year old caps still installed in the PSU... and it's malfunctioning.
Two of the caps have already leaked slightly onto the board. I have not desoldered or measured any so far but they should qualify for replacement.
Now I'm wondering what to put in there as a replacement. First idea was state of the art low-ESR Nippon KY,...
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