hifi engine

Capacitor equivilant

I have a JVC amp A-S3 which has two caps made by TOWA 87100 (QEW81HA-688H in service manual) the company was taken over by NICHICON in 2008 but i can not find anything compatible. They are 30mm Dia x 50mm high 50V 6800uf 85 c electolytic radial 3 pin, can anyone point me in the right direction if possible to get over this without scraping my amp?
Cheers



Capacitor equivilant

Parts Connection (http://www.partsconnexion.com) is a good source for audio parts. They have several 6800uF, 63V caps in stock. The higher voltage rating would be fine (more reliable usually) but the body size may be larger than a 50V cap.

drsmith, MSEE

Capacitor equivilant

If you do replace the 6800uF with a higher capacitance cap with similar ESR value, your inrush current will typically increase. For example a 10,000uF cap would draw about 10/6.8 or 1.47 times the original inrush current. If the ESR of the new cap is lower than the original, this too will allow higher inrush. If your amp has inrush current mitigation circuits, you are probably ok, otherwise you may be stressing the FWBR component(s) and maybe the AC line fuse.

drsmith, MSEE

Capacitor equivilant

Mouser Electronics has Kemet capacitors; stock number 80-ELH109M050AS5AA is 10,000uf at 50 volts; measures 30x45mm.
You can call them and ask if there are any others that might work.

Capacitor equivilant

Thanks Johnnysan,
phoned today and they checked all the information given and informed me later that their suppliers do not have anything equal to these discontinued caps. Has anyone got two of these kicking around? LOL

Capacitor equivilant

I have developed an elegant solution for replacement of *ANY* output capacitors need for just about any variation you might need. The terminals will be #10 stud screw terminals. All I need to know is 1) Value, uF and volts 2) Dimensions, diameter and length in mm.

As an example, I have a Yamaha M4 where both output caps 15,000uF w/solder lugs had no substitutes. To make matters worse, the solder lugs went through the main board and solders to the other side. The physical dimensions of replacement caps had to fit the existing area and they had to have lugs placed precisely like the originals. I successfully created an adapter that worked.

I also have developed LED retrofit kits for popular receivers where the LEDs perfectly match the warm glow of the original incandescent lamps.

Capacitor equivilant

I wouldn't put used or old electrolytics in a deck; you are just asking for trouble down the road. You can use a somewhat larger value cap, as long as the voltage rating is the same or higher. Going from 6800 to 10,000uf is not that much of a jump.
My assumption was that the physical size of the caps was critical.

Capacitor equivilant

Your assumption was correct as these two caps sit beside each other with little free space between (about 3mm) the main problem being that they are 3 pin snap-in triangulated on a 8mm radius (16mm between pins)

valle3452's picture

Capacitor equivilant

I ran into the same issue while working on a vintage Yamaha A1 not long ago. I found some very nice Capacitors made by Cornell-Dubillier that have a 5 Pin pattern (three of those pins are obviously dummy pins) so I clipped the dummies off and soldered small lengths of solid 18 gauge copper wire to the Positive and Negative pins to shape them into position on the PCB. I also had to re-shape the holder/bracket to fit around the reduced diameter of the new CDE caps. A bit of foam padding between bracket and caps was also needed to help the bracket support them tightly. An image of such conversion can be seen here: http://i45.photobucket.com/albums/f79/valleep/Yamaha%20A-1%20Integrated/...

Amp is no more

Thanks everybody for your help, my amp is now in HI-FI heaven as I have purchased an old Yamaha AV amp for less than the price of new capacitors ( I suppose I have still saved one from the scrapheap!) It has the same performance if not better than old amp and is just the job.

Cheers again

PS.. Merry Xmas