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Filter caps - K100-2 [message #23034] Wed, 03 June 2015 17:06 Go to next message
gui_tarzan is currently offline  gui_tarzan
Messages: 24
Registered: May 2015
Junior Member
So the stock caps are 2500mfd, 50v and I have some 2200/50v but they're TINY compared to the originals. I know, they're large cans vs small radials, I'm just unsure if they're big enough physically or if it even makes a difference?

--Jim
Re: Filter caps - K100-2 [message #23035 is a reply to message #23034] Wed, 03 June 2015 18:15 Go to previous messageGo to next message
chicagobill
Messages: 1959
Registered: April 2003
Senior Member
Size doesn't matter. Well at least physical size doesn't.

The original Mallory caps were called "computer grade", which meant that they were designed to a higher standard than normal consumer grade caps. That is part of the reason that they have lasted so long.

Modern caps are much smaller than old caps, but the trade off is that they don't seem to last as long.

In the rare occasions that I need to replace them, I use the larger sized "snap-in" caps, which come in larger diameters. I will either build a small circuit board to hold the new caps in place that has screw in contact points to connect the original wires to or I use some sort of thick ring to adapt the smaller diameter caps to the size of the original cap clamps.

Some folks like to increase the value of the caps to double or triple the original ratings.
Re: Filter caps - K100-2 [message #23040 is a reply to message #23035] Thu, 04 June 2015 15:26 Go to previous messageGo to next message
Kustom_Bart is currently offline  Kustom_Bart
Messages: 601
Registered: October 2010
Location: Greenville, MichiGUN
Senior Member
For sure what ChicagoBill said, do not go lesser value of modern caps, go bigger and they will last much much longer. That is exactly what my guy told me to do that fixes the stuff on mine that I can't.
Re: Filter caps - K100-2 [message #23041 is a reply to message #23040] Thu, 04 June 2015 18:11 Go to previous messageGo to next message
gui_tarzan is currently offline  gui_tarzan
Messages: 24
Registered: May 2015
Junior Member
That's what I thought, I haven't worked on one of these before so I wanted to be sure. Thanks!

--Jim
Re: Filter caps - K100-2 [message #23043 is a reply to message #23034] Thu, 04 June 2015 21:58 Go to previous messageGo to next message
gui_tarzan is currently offline  gui_tarzan
Messages: 24
Registered: May 2015
Junior Member
Fortunately I didn't have to get into the caps, I cleaned the jacks and pots and the raucous hum went away so my guess is one of the input jacks wasn't shorting correctly.

--Jim
Re: Filter caps - K100-2 [message #23046 is a reply to message #23034] Fri, 05 June 2015 06:24 Go to previous messageGo to next message
stevem is currently offline  stevem
Messages: 4311
Registered: June 2004
Location: NY
Senior Member
That would be correct and a cool easy fix, no?
Re: Filter caps - K100-2 [message #23048 is a reply to message #23043] Fri, 05 June 2015 08:09 Go to previous messageGo to next message
gui_tarzan is currently offline  gui_tarzan
Messages: 24
Registered: May 2015
Junior Member
Yep! The original question was more for information, I haven't seen caps like that in a SS amp before.

--Jim
Re: Filter caps - K100-2 [message #23050 is a reply to message #23034] Fri, 05 June 2015 08:18 Go to previous message
stevem is currently offline  stevem
Messages: 4311
Registered: June 2004
Location: NY
Senior Member
To this day I am still no sure that the original big can type filters do not make for less power supply sag at high output levels as compared to new smaller ones!
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