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Replace capacitors polyswitch - Yamaha Emx5016cf S115v PA System

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I have a DigiTech 2101 studio tube and need to know which capacitors (I think there are "8") to replace that have the most affect on the sound quality.thanks!

You can see if a capacitor is bad by looking at the top. If it is flat, it is good. If it looks like the top is bulging, then it needs replacement. Sometimes you will see it leaking under it. If you are capable, you can remove the capacitors to isolate and test with a multimeter.

Dec 18, 2016 | The Music

1 Answer

Blown filter capacitors

What model amp do you have?

Apr 25, 2014 | Marshall Music

1 Answer

Fail capacitors how to replace


If capacitors are electrolytic types, then they have polarity + and -, and always are a mark on the pc board and it could be marked with either the "+" symbol or "-" capacitor has a mark itself that denotes polarity also, the most common mark i have seen is "-" running from top all the way down at a side of cap, you just have to buy them same voltage and capacitance rating and install them verifying TWICE the correct polarity and you are done, Mouser electronics has a wide stock of electrolytics, but remember polarity otherwise you will get a very big pop.

Oct 27, 2013 | Behringer BXR1800H Ultra Compact 180 Watt...

2 Answers

If i replace my yamaha crossover capacitor, what will be the consequences

The capacitor determines the cutoff frequency of the filter used to either block or pass frequencies above or below the intended design point. Generally, electrolytic capacitors are used for this, due to their capacity for a given size. electrolytic capacitors are manufactured with two foil plates separated by a gauze soaked in electrolyte compound. This electrolyte compound forms a one molecule thick insulation layer. If this electrolyte dries up, the cap will tend to fail, either short or open, usually short. Because the insulation so thn, it is very much affected by the applied voltage (usually DC). Most electrolytic capacitors are used to block DC. these capacitors are usually pretty sensitive to the applied voltage. Most electrolytic capacitors have a WVDC rating, which stands for Woirking Voltage Direct Current. The higher the WVDC rating, the largewr the capacitor for a given capacitance. Also, these capacitors have a very wide tolerance because of this. Typically, this tolerance is +10%/-80%. This rating would indicate that at close to the WVDC rating, the capacitor will be within 10% of its rating. If the capacitor is used in a circuit where the WVDC rating is much higher than the circuit voltage, their will not be enough bias voltage to form the one molecule thick dielectric (insulation) needed for the rated capacitance. So, if the capacitor is rated for 100WVDC and is used in a circuit that only has 40 volts, the effective capacitance will be much lower, and therefor, the crossover frequency would be affected. If the crossover filter is a high pass, then you would risk damage by allowing too much low frequency content to get to the mid/high frequency driver(s). For a low pass configuration, too much high frequency material would get to the woofer, which might affect imaging, but should not damage the driver. Also, electrolytic capacitors come in many varieties. Almost all of them are polarized, meaning that the terminals are marked plus and minus. Capacitors for crossovers are not typically polarized. Here is a link to some non polarized electrolytic caps:,1385

Most audio enthusiasts prefer the sound of polypropylene, polycarbonate or polystyrene capacitors over aluminum electrolytic caps, which also have the advantage of not drying out over time, so they last longer. Also, aluminum electrolytics tend to fail if they do not have a bias voltage applied for a long time. Here is a link to some film cpas for crossovers:,1382

Oct 29, 2012 | Yamaha Emx5016cf S115v PA System

1 Answer

No phantom voltage on XR1600F. Any suggestions?

Potentially. Capacitors are what prevent the DC component from flowing through the amplifier where you want only AC, so it is pretty brutish and easy to find.

It likely is a failed zener diode, or a failed bridge rectifier, or single rectifier depending how they chose to do it. Since it is isolated to the inputs, that is where it will attach. Either to pin 2 or 3 on the XLR. It will be isoalted from the preamp by a capacitor on the order of 0.1 microfarad to 0.01 microfarad. It might be higher, but not likely.

If replacing a Zener, match for voltage, but go to a higher current type. If replacing a 1 amp bridge rectifier, go with a 3 amp if there is room. If replacing an 1N4001/1S4001 go to a 1N5403 or higher voltage rating even.

Feb 12, 2012 | Peavey Music

1 Answer

Could u please send me a circuit diagram of Peavey sp2 crossover with the exact rattings or values of the parts? cos the image of the bulb you have sent is different from the one in my speakers

Here is a link to forum that someone has posted the soundguard protection circuit down the page:

The 1156 lamp MAY have slightly different shapes but is an automotive lamp. If the bulb is blown, the polyswitch fuse is likely blown as well.

Jan 14, 2011 | Peavey SP2 PA Passive Speaker

1 Answer

Need a capasitor for crossover

Find them at Search first for "Capacitor" then select "Non-Polar"

HOWEVER there is a part that LOOKS like a ceramic capacitor but it is NOT. It is a "polyswitch" which is a resettable fuse. Go to the site and search for "Polyswitch". Then select 60 volt in the filter and Radial... see if you can find the item. Also consider opening a second speaker if you have it to get the number off one that is still OK. This is part of a protection circuit and needs to be replaced with exact device.

Dec 29, 2010 | Peavey SP2 PA Passive Speaker

1 Answer

I just replaced the fuse with a lesser fuse now the amp just hums. The pots are all on low and it does this with or without a instrument plugged in

This is likely a power supply problem such as a bad filter capacitor. If the fuse blew before, probably one of the rectifiers blew due to a shorted capacitor followed by one or more diodes failing.
Take unit in for repair unless you are adept at electronics.

Dec 01, 2010 | Marshall Amplification Marshall AS100D 2x8...

3 Answers

Peavey SP 2G has a burnt ceramic capacitor in crossover

Ive been through this. Although it certainly appears to be a ceramic capacitor, its actually called a polyswitch. .65 amp. Parts express carries them. Part no. 071-256.

Mar 28, 2009 | Music

1 Answer

Burnt ic chip on Korg microKorg pcb.

Hi Mate, I have the exact same problem, casued by wrong adaptor being connected by accident, did you manage to find what the code is on the IC5 chip ?, I can see NSV, but there is another letter or number before it but cant make it out as that where its burnt.

Jan 17, 2009 | Korg Music

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