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Post by karma67 on Oct 27, 2019 9:10:09 GMT
as above,im thinking about replacing the 43yr old electrolytics in my turntables power supply. whats you choice of good quality caps for this area? im wary to do it as its working fine,should i do it a a preventative measure? opinions welcome both fore and against.  |
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Post by sq225917 on Oct 27, 2019 9:19:09 GMT
Replace like for like, stay away from anything 'audio'. I suspect Panasonic nh and nhg for small value and maybe fm and fc for the larger caps. No doubt nichicon will have some similar still available
Start off by finding the specs of what's in there already.
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Post by karma67 on Oct 27, 2019 9:31:04 GMT
Replace like for like, stay away from anything 'audio'. I suspect Panasonic nh and nhg for small value and maybe fm and fc for the larger caps. No doubt nichicon will have some similar still available Start off by finding the specs of what's in there already. cheers si,i have a list of sizes which matches the parts list in the service manual. |
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Post by karma67 on Oct 27, 2019 17:34:32 GMT
it would appear theres more to it than just changing like for like,ripple current values etc,where do you start with that?
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Post by Deleted on Oct 27, 2019 18:18:12 GMT
No need to sweat it Jamie... any modern cap of same uF and Voltage (you can go as high as you like on Voltage and will likely find you need to go to a higher voltage rating anyway to get something of roughly the same physical size) that isn't designed as a miniature space saving variant will be better than the originals. Any decent brand will do. Choose 105C rated ones for longer life.
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Post by karma67 on Oct 27, 2019 18:25:26 GMT
No need to sweat it Jamie... any modern cap of same uF and Voltage (you can go as high as you like on Voltage and will likely find you need to go to a higher voltage rating anyway to get something of roughly the same physical size) that isn't designed as a miniature space saving variant will be better than the originals. Any decent brand will do. Choose 105C rated ones for longer life. ah that makes it easier, thanks jez! |
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Post by Deleted on Oct 27, 2019 21:04:42 GMT
I did a Pink Triangle 'LPT' PSU with Panasonic 'FM' They have a high operating temp..
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Post by sq225917 on Oct 27, 2019 22:19:34 GMT
Yeh look for 105 degree wherever possible, they might not need that operating temp limit but they'll give longer lifespan at any temperature.
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Post by karma67 on Nov 2, 2019 11:40:03 GMT
ive just ordered all the caps to replace the electrolytics,all bar 1 is the nichicon pw series.
i will go on the side of caution and replace 1 at a time and check the tt's operation,that way if there's a problem i can narrow it down to the last cap change rather than 20 odd potential canidates lol
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Post by dsjr on Nov 2, 2019 12:11:27 GMT
Doing a mk2 Xerxes supply right now with 105 degree caps and you can see the hot spots around the driver and output stages too, although the solder joints 'look' ok on the surface. The company don't do repairs on these and I'm told they want £500 for a replacement. Hope 'caps' is all it is as I'm beggared if it's deeper than that.
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Post by dsjr on Nov 2, 2019 14:45:38 GMT
as above,im thinking about replacing the 43yr old electrolytics in my turntables power supply. whats you choice of good quality caps for this area? im wary to do it as its working fine,should i do it a a preventative measure? opinions welcome both fore and against. Just noticed - is that 35V 2200uF cap leaking or is it an adhesive that many manufacturers used? Jez? Anyone? |
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Post by Deleted on Nov 2, 2019 15:25:49 GMT
as above,im thinking about replacing the 43yr old electrolytics in my turntables power supply. whats you choice of good quality caps for this area? im wary to do it as its working fine,should i do it a a preventative measure? opinions welcome both fore and against. Just noticed - is that 35V 2200uF cap leaking or is it an adhesive that many manufacturers used? Jez? Anyone? It's adhesive or damping compound. You can see a strip of it between the blue cap and the grey one to stop them buzzing against each other. |
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Post by karma67 on Nov 2, 2019 16:01:08 GMT
as above,im thinking about replacing the 43yr old electrolytics in my turntables power supply. whats you choice of good quality caps for this area? im wary to do it as its working fine,should i do it a a preventative measure? opinions welcome both fore and against. Just noticed - is that 35V 2200uF cap leaking or is it an adhesive that many manufacturers used? Jez? Anyone? yeah its adhesive dave |
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Post by dsjr on Nov 2, 2019 16:30:18 GMT
OK, thanks for pointing that out. Elna and Nichicon do look to be better quality brands, so maybe these caps are fine in that case. I have a 45 year old technics 1500 here and it's not the caps that have gone off, it's the speed pots (two coarse ones on the board and the two deck plate ones) and also the main switch (33-off-45) contacts playing havoc.
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Post by Deleted on Nov 2, 2019 19:49:03 GMT
I bought a Technics SL1200 recently second hand and the previous owner had removed the psu to a seperate box but still connected to the deck. I'd like to first replace the mains cable which is
to thick and add sockets in and out of the psu box so that it isn't constantly attached. Then I'd like to investigate the possibilty of replacing/ upgrading caps etc. I'm reasonably confident with the
first bit as screw fit sockets are probably available but and this is a major sticking point for the second phase my soldering skills are ham fisted at best. Also obviously I'll need an iec input socket
for the mains but what male and female socket will be best for the record player side of things, a two pin?
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Post by karma67 on Nov 8, 2019 19:01:08 GMT
all the 43yr old electrolytic capacitors have now been changed to nichicon pw series caps. all in all im very pleased with my work. did they need doing? well surprisingly the old ones didnt measure too bad except one.    |
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