Home » VintageKustom.com » Repairing Kustom Amps » Caps for my K200 B5 Buzz problem

Show: Today's Messages :: Show Polls :: Message Navigator

Caps for my K200 B5 Buzz problem [message #8808] Sun, 12 August 2007 16:34   blindbnisee Messages: 3 Registered: August 2007 Junior Member I have my old K200 B5 PA That Buzzes like crazy when you power it up. It works and is still loud as heck! I am assuming I could replace the 4500 MFD 50 VDC Capacitors to fix this... unless anyone has a better idea? If that is a good place to start... What options in Capacitor could I go with... I can't seem to find an exact 4500 MFD 50 VDC anywere... so could I go with something like a 4600 MFD or something? Thanks if you know! Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8812 is a reply to message #8808] Mon, 13 August 2007 12:11 chicagobill Messages: 2005 Registered: April 2003 Senior Member Welcome to the board. Yes, replacing the filter caps would be a good place to start. One problem that you will find is that most modern caps are much smaller in size than the old ones, making mounting them a little tricky. Use the 4500mf 50v rating as a starting point. Think of these values as the minimum ratings for your replacements. Modern values would be 4700mf 50v. Some guys here on the board, replace their caps with values as high as 10,000mf. The point to remember is that these caps are polarized and must be installed with the correct polarity. So when you remove the old caps, be sure to match the new ones + to +, and - to -. Bill Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8813 is a reply to message #8812] Mon, 13 August 2007 13:08 C4ster Messages: 686 Registered: June 2001 Location: Mukwonago, WI (Milwaukee... Senior Member Actually, I replace the caps in K100's with 10,000 mfd units and the originals are 2500 mfd. By that rule of thumb, 18,000 to 20,000 mfd should work. The only possible problem I would see is the fuse may need to be slightly larger but at least a slow blow instead of a fast blow fuse. OK maybe 20,000 is pushing it but the net result is a bit more headroom before distortion occurs. The larger caps will allow more power before the voltage starts to drop thus limiting your power output. This will NOT give you more power, just more power before distortion. You can see this by watching the light on the front of the unit. Yes, that nice purple light!! You will see it dim as you push the amp hard. It also will be noticably longer when you shut down. The hissing will hang on a lot longer. Conrad Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8814 is a reply to message #8808] Tue, 14 August 2007 06:52   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Has this k200 PA been changed over to a grounded power cord? The reason a ask is that you are using the word buzz to discribe the noise, as bad filters will make a 120 hz HUM (about low B on a 6 string guitar)a ground loop problem (when 2 units are both grounded when you only need one) will make a 60 hz hum which is about low E on guitar. A buzz may mean you need a ground lift adp if you have a 3 prong a/c cord. Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8815 is a reply to message #8814] Tue, 14 August 2007 13:11   blindbnisee Messages: 3 Registered: August 2007 Junior Member Thanks but no it is not grounded. And it buzzes without anything pluged into it and with all gain down. Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8816 is a reply to message #8812] Tue, 14 August 2007 13:14   blindbnisee Messages: 3 Registered: August 2007 Junior Member Thanks! To you all! You were a great help... I will keep you posted on my success! Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8817 is a reply to message #8808] Wed, 15 August 2007 06:34   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Great, let us know how it goes. Mouser sales carrys the Mallory brand computor grade caps in the drop in size you need, but they are not cheap.I would go that route if you do not mind the price. Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8828 is a reply to message #8808] Sat, 25 August 2007 16:06   ianb Messages: 13 Registered: July 2007 Location: tennessee Junior Member are these the caps you guys are usin'? http://www.mouser.com/search/ProductDetail.aspx?R=CGS103U050 V2Cvirtualkey53900000virtualkey539-CGS103U050V2C Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #8829 is a reply to message #8808] Mon, 27 August 2007 06:37   stevem Messages: 4733 Registered: June 2004 Location: NY Senior Member Yes, those wil work, but they are a fair amount smaller in diameter then the 3" diameter of the originals. You can rap a bunch of electrical tape around the base, or cut a sliver off a card board shipping tube and the slit that open to expand and work. just make sure to make a diagram of how they hook up, as failure to get it right will take out half of the amps output and driver transistors on power up! Report message to a moderator

Re: Caps for my K200 B5 Buzz problem [message #17844 is a reply to message #8808] Wed, 05 December 2012 19:07   Dism2000 Messages: 14 Registered: November 2012 Location: CANADA Junior Member Hi, just like to know, did you replace the filter caps with 10,000uf and did it work. Report message to a moderator

Previous Topic:	Bigger Capacitor ?
Next Topic:	Static in Column Speakers

Goto Forum:

- VintageKustom.com  Comment Board  Replacement Part Suggestions  Repairing Kustom Amps- Classified Ads  For Sale  Wanted- FUDforum Questions & Problems  Questions & Problems about FUDforum