I need help finding a 18000uf 71 volt capacitor

M

Mike16W

Member
I am replacing some capacitors in a Yamaha CR-1020 receiver. The power supply board has two 18000 71 volt capacitors. I have not been able to find anything close to it. The receiver is 30 years old and I would like to replace those electrolitics. Can someone point me in the right direction.

Thanks
 
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Are these soldered directly to a board? On the 2020, the caps are laying down under the regulator board, and soldered to a board with the rectifier diodes. If this is the case, then the diameter of the stock caps is critical because it will determine the distance between the terminals. If the caps are soldered to a PC board, you also need to check that there isn't something odd about the placement of the terminals that would preclude the simple substitution of a newer cap.

71V caps haven't been made for a while...a modern cap would be either a 75V cap, or more likely, an 80V cap.
 
I will check to see how they are layed out

I will pop the cover off the unit tomorrow and see how they are layed out. Thanks for the help.
 
Well, I took the covers off and

The two caps are laying down horizonally and attached to a riser board buried under the capacitor board. It is going to take awile to tear it down further in order to see the dimensions of the caps. I may end up leaving those two in there and replacing all the other electrolitics.
The schematic shows that there is 49.6 VDC on the cap.
 
I don't think I would go less voltage than the originals, going somewhat higher in voltage is really best, but not higher in uF
 
A 63V cap would be fine on 49V.
I have seen original 50V caps on 49V power supply in pioneers, thats not a good design and gets to early aging of the caps.
 
Sure, if the schematic is correct. I know in the case of the Pioneer SX-1050, the early production had 80 volt 22000uF caps, same as the SX-1250, but the later production units had 71 volt. When I replaced them, I went to 100 volt caps. I would think operating a cap under it's rated voltage would make it last a lot longer.
 
I see that Sony is using capacitors of this rating in their new and recent products. Try an authorized Sony repair station and see if they can get some for you.
 
The schematic is wrong, the caps on the CR-1020 are really 15,000 @ 63V, the 18,000 @ 71V are what is in the CR-2020. Since bothe receivers use a common chassis and circuit boards I guess someone just copied the 2020 info into the 1020 schematic. I have yet to need to replace them in either receiver but should I ever have to do so I will get creative with some MDF because you can't find the right size in any catalog I have seen.

Rob
 
merrylander, thanks for the correction

It is good that you have never had to replace these caps. I may just leave them along. There is plenty of other caps etc to update.
Thanks again.
 
I recently recapped a Yamaha integrated amp and the filter caps were toast (along with every cap on the PSU pcb). Replaced the 71v caps with 80v units from Digikey. Had to clip off the middle terminal to get them to mount but that's unimportant. The new caps are maybe 1/2 the size of the originals even though they are 22000uf iirc.
 
I could not find the caps at Digikey

Could you point me in the right direction. I could not find the caps at Digikey.

Thanks
 
I found them......@24.74 each? Ouch

I may wait a bit to order them. Santa is getting a little broke this time of the year.
Thanks for pointing me in the right direction.
 
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