Capacitors for the M types.

mudder · Post by **mudder** » Sun Jan 03, 2010 8:59 am

Can someone give me the specifications off the rail capacitors for the M100, M50, M44, M25.
And do they need to have the same capacitance as the original ones.
For example if i can put bigger ones in, is that ok.(bigger Capacity)

Philip.

Pillow · Post by **Pillow** » Mon Jan 04, 2010 10:07 pm

Post by **mhyde71** » Mon Jan 04, 2010 10:41 pm

give me a day or two and i'll have the info you're looking for/needing... and yes you can go up in ohms rating, but the voltage i would try to follow suit with the OEM specs

Bertje · Post by **Bertje** » Tue Jan 05, 2010 5:46 am

You can put bigger in, with the same or higher working voltage. So original 4700uF/35V can be exchanged with 6800uF/63V.
But......most of the time they won't fit on the pcb or in the heatsink, just to big (diameter or hight).
And try to find low ESR types, like Panasonic TSHA or FC.
Rob.

mudder · Post by **mudder** » Wed Jan 06, 2010 12:46 am

Ok thanks guys.

mudder · Post by **mudder** » Wed Jan 06, 2010 12:50 am

Bertje wrote:You can put bigger in, with the same or higher working voltage. So original 4700uF/35V can be exchanged with 6800uF/63V.
But......most of the time they won't fit on the pcb or in the heatsink, just to big (diameter or hight).
And try to find low ESR types, like Panasonic TSHA or FC.
Rob.

So you can change a 35V with a 63V type, or something else.
I tought you need to get as close as possible to the original voltage.
For example, if you have a 50V cap you only can change with another 50V cap.

Philip.

Bertje · Post by **Bertje** » Wed Jan 06, 2010 10:59 am

No, that's not necessary. It has to the same or higher.
Rob.

mudder · Post by **mudder** » Thu Jan 07, 2010 10:05 am

Das goed om weten bedankt.

Thats nice to know.

Post by **stipud** » Thu Jan 07, 2010 10:33 am

http://www.digikey.be/

The powersupply input caps are 18x31.5mm. I personally recommend the Nichicon 493-1543-ND or Panasonic P11210-ND. Both have served me well in my upgrades! I cannot hear the difference between them, and the Nichicons are cheaper and have a longer rated life, so I usually use them. These are also the same capacitors recommended by Eric in his M cap replacement tutorial: http://soundbuggy.com/Eric/Car%20Audio/ ... index.html

Not sure what size the railcaps are in your M series. I know they used some different sizes than the MS...

mudder · Post by **mudder** » Thu Jan 07, 2010 11:25 am

stipud wrote:http://www.digikey.be/

The powersupply input caps are 18x31.5mm. I personally recommend the Nichicon 493-1543-ND or Panasonic P11210-ND. Both have served me well in my upgrades! I cannot hear the difference between them, and the Nichicons are cheaper and have a longer rated life, so I usually use them. These are also the same capacitors recommended by Eric in his M cap replacement tutorial: http://soundbuggy.com/Eric/Car%20Audio/ ... index.html

Not sure what size the railcaps are in your M series. I know they used some different sizes than the MS...

The input caps aren't the problem, but the rail caps.
Are they the same as the input caps. I mean what type of cap is used.
I think aluminium foil ones but i'm not sure.

And can i raise the capacitance of the rail caps.
For example, the M44 uses 2 rail caps of 15000µF 35Volts, is it possible to rais them to, let say 20000µF 35Volts.

Philip.

Post by **stipud** » Thu Jan 07, 2010 12:58 pm

You can raise the capacitance as much as you want (the more the better) but you want to keep the voltage as close as possible. The voltage cannot be lower, but it can be slightly higher (though you lose capacitance the higher voltage you go, so keep it as close as you can).

In the MS amps at least the caps are aluminum snap-in type caps. I believe this is the same in the M caps. I think the biggest M amps share the rail capacitors with the MS series. These are 35x35mm, like the Panasonic P6669-ND from digikey (available in many other voltages). I know the M25 at the very least uses a completely different smaller size, but I dont know what dimensions they are or what caps to use. Also, finding higher capacitance than the factory rail caps is very difficult, while the power supply caps are quite easy to get with more capacitance. PG put in really good caps back in the day!

And if you're replacing rail caps you absolutely NEED to do the power supply ones. They are MUCH more likely to fail, they are cheap and easiest to do while you're working on the amp. If you have a rail cap leaking it is probably a manufacturing defect because they usually last a lot longer.

mudder · Post by **mudder** » Fri Jan 08, 2010 8:09 am

Ok thats good to know.
Bedankt Stipud.

BTW. it's snowing here in Belgium.

Philip.