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My beaitiful Knight KG 250 amp has a loudly humming 6 lead filter cap. Can I ever find a replacement? This amp had a wonderful, rich tone. Thanks, Floydian

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Try to search for "filter capacitor" at www.ebay.com

I did a search and found some. Look for the value of your current filter caps and find capacitors with the same value.

Posted on Apr 30, 2010

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Klh powered subwoofer model ASW10-120B... when you plug in to power... it makes a loud buzzing/humming noise


I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.

when-plug-in-power-makes-loud-buzzing-lgqxs5x4gp2eri5a2qchwtne-5-0.jpg

when-plug-in-power-makes-loud-buzzing-lgqxs5x4gp2eri5a2qchwtne-5-1.jpg

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Jan 05, 2016 | Audio Players & Recorders

1 Answer

My amp makes a loud foghorn type noise whenever turned on. Even if i have the volume turned all the way down and the guitar unplugged it still hums. I'm not sure if its an amp or speaker prolem. I took...


Likelly the TDA7293 chip in the power amp has failed. It shorts to one power rail and drags the power down where it hums... this CAN damage the speaker if left on. Verify the problem and replace the chip. Slight chance there are bad electrolytic filter caps but those are easily spotted.

Aug 06, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

Fender vibrolux. Very (loooud) loud hum/buzz All tubes but the 6l6's removed. History: bought this amp as a repair project. replaced all caps. originaly the amp was quiet but but had very little volume...


Here is the schematic:

http://elektrotanya.com/fender_vibrolux_6g11_schem.pdf/download.html

Check the quality of the DC bias as being free of ripple.across teh 25 mfd/50v cap filtering the bias.
If much ripple there, replace the cap. Also the .05 bypass on the swinger of the intensity control.

This should be an easy fix, but you might need an oscilloscope to diagnose it quickly... or just parallel caps across these to see if it kills the hum.

The main high voltage filter caps are also suspect as well as the bypass of power to the ealier inverter stage a 16mfd/450v

There are lethal voltages in this so use great caution when troubleshooting... the caps hold a nasty charge.

Feb 06, 2011 | Fender Custom Vibrolux Reverb Tube...

1 Answer

Have an older Lowrey organ with loud hum.


Of course it is repairable.

Find a competent repair person. You did not describe the "noise". If it is 60 cycle hum, the filter caps need replacing. If it is an organ tone, then probably a key contact is stuck.

May 05, 2010 | Music

2 Answers

Adcom GFA 5500 'mechanical' hum from amplifier


Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

Apr 24, 2010 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

I need a filter capacitor for a Knight KG-250 integrated amp. It has six leads-six different capacitances provided-I need it to get rid of an awful hum. Do I stand a chance of finding one or shall I junk...


Would you be able to post the capacitance's and the voltage ratings?
If you are not able to find the one with the 6 leads, you can try to find them individually and that should work just fine.

Nov 30, 2008 | Audio Players & Recorders

1 Answer

PEAVEY TRANSTUBE AUDITION 110. PLUG UNIT IN POWERS UP . SITS THERE AND HUMS LOUDLY. SPEAKER WORKS. plug guitar in can hear it faintly, push lead chanel button in , hum gets super loud. HUM IS IN PROPORTION...


There should be an 8 pin IC close to the input jack that will be marked 4558 or 4560. This is an Op-amp Ic that is the most likely cause of the problem. Replace that IC and report the results here.
Dan

May 27, 2008 | Audio Players & Recorders

1 Answer

JBL PSW-D110 Humming Loud


If I remember these correctly, there is a bad coupling cap in the amp section. You should see it as the top should have ballooned up. Replace the cap and you should be OK.
Dan

Mar 25, 2008 | JBL PSW-D110 Speaker

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