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I have a flex120h and im replacin a resistor i need to know the size

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  • Kevin Penn Aug 30, 2010

    Can you tell me the colours on the resistor, make sure the gold or silver band is to the right



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You might get the info you need by contacting a Service Center here:

Posted on Aug 30, 2010


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Where will I find a schematic with wattage values for all the resistors

Use this in Google to fine manuals and schematics:
Epiphone junior amplifier manual Google zoeken
Most resistors are 1/4 watt, unless something is added in the schematic.
You also can deduce the wastage, because for every size is a wattage, or the other way around.
When you are not sure, and it fits, use a bigger resistor. The same resistance (ohm) but a higher wattage is no problem as long as it fits in the housing.

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Need Schematics for Mackie C300 Speaker

Do you have the existing resistor, Larry? Is it crisped up, or can you still read the colored bands? Those colored bands are a color code indicating its resistance - if you can read them off here, we can tell you what its resistance is.

As to wattage... that's something we could at least estimate from size & shape, weighted a little by speaker wattage rating (that resistor should never see as much wattage as the rating).

Last... if we knew for sure what every other component is (from its printed labeling), we could reconstruct the schematic and calculate that resistor's value. Reverse-engineering a crossover designs is far from being rocket surgery. 8)

I offer these as alternative approaches; it may be near-impossible or impossible to get that schematic.

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My spider III has a broken resistor on the pcb board, number D20. I need to know the resistence numbers so I can replace it.

If the damaged component is designated D20 then it is a diode. If it was a resistor it would be marked as R20.There is a copy of the circuit available here

Dec 03, 2011 | Line 6 Spider Iii 15 Modeling Guitar...

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I have a burnt resistor on a V55hd head. It is near one of the powertubes. Need to know how to calculate the value for replacement, and know if there is some sort of resistor type that will be more heat...

Usually the amplifier will have "symmetry" and there will be matching resistors near the other power tubes that you can get the value from. This is PROBABLY a screen resistor for the tube and values are often around 470 ohms or so but I could not find a schematic. These USUALLY don't fail unless a tube has shorted. Heat sinks are NOT used. The best resistors for the purpose are "wire wound" ones and of a suitable wattage rating. Sometimes we put ceramic beads on the leads to raise the resistors off the board to allow air circulation. Occasionally solder will break and the arcing at the leads adds to the heat. If you trace where the resistor goes by pin number of the tube and the type of the tube that would help me to help you... trace a matching tube to the same pin and you will likely find a matching resistor. Note that some power resistors DO change color a bit after they get hot in use, but if they char or the coating falls off that is a failure.

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There are two resistors 310-3 10R on the power supply of the Europower pmp 5000, i need to know if it is 330k or 330om.

The schematic for the power supply does NOT show resistors in the 310-3... Where are these in the circuit... IF THESE happen to be the gate drive resistors for the IGBT's they are 33 ohms. If you have hasd a failure in this area there are other parts that typically get destroyed, including one or both the speedup diodes at the same gates; Here is the complete PMP5000 schematic:

Scroll down to "get manual" and cliick to download. IGNORE other download links. If you need help restoring the PSU get back to me.

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I need to know the value of the Resistor "R1" in

Let us use a bit of logic to resolve this... I have an Axiom but it would be a lot of screws to take out to get to the part... so let us think about this. The resistor value starts with a "1" and we know it is 5% tolerance (gold). we know the resistor burnt up with likely 5 volts on it... Value could be 1000 ohms, however the voltages present (12 volts max) would NOT have burned up a resistor of 1000 ohms. The USB area is mostly 5 volts and across 100 ohms is only a quarter watt... not enough to really burn up a resistor... First thing is to MEASURE that the resistor s open... in spite of being burned, it MAY still be OK... these resistors now usually either open or remain close to their value. The resistor ALSO may be a fusible resistor intended to act as a fuse... Is the resistor open or not? is it near a resistance with a "1" as the first digit? If it is not open I suspect it is not all of the problem. In that case, look for a burned circuit trace on the board. If it is open, then MEASURE the voltage across the resistor with the power applied. If you find 5 volts, then it MIGHT be a 10 ohm used to limit the USB current to 500ma. Get back to me with your findings... I have unraveled many of these things...

Jul 12, 2011 | Music

1 Answer

Blown fuse on the board.The fuse is so welded in? does this fuse control the crossover?

There is a speaker protection network in most of Peavey speakers protecting the tweeter horn.

It consists of a Polyfuse (round disk about the size of a nickle or quarter, a resistor and an incandescent bulb.

Circuit can be found at: (go to last post attachment)

Copied from earlier post I made for another.

For the MOST PART the lamp is NOT the primary path for the speaker current, the POLYFUSE is and is a low resistance until it is overdriven.

The bulb is a 12 volt bulb and is nominally 2.1 amps when used on 12.8 volts.

If this is in regards to the other problem mentioning 32 watts and 12.8 volts... this bulb is NOT 32 Watts, it is 32 CP or 32 Candlepower which is NOT Watts in general. The lamp is actually around 27 Watts when run at its ratings.

It is important to realize that the lamp and the resistor are there ONLY as a "soft" path when the POLYFUSE opens due to overcurrent. When the polyfuse cools, the lamp and resistors are effectively shorted by the Polyfuse and most of the current again flows through the polyfuse..

Mar 06, 2011 | Peavey PR15 400w PA Speakers

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Peavey amp shut down

The output stage has a problem. From your description, I'd guess that the high voltage supply has failed. The low volume and distortion suggests that you are trying to power the speakers from the driver section rather than the outputs. There is a resistor that fails in some of this series. If I remember correctly it is either a 2K or 3K resistor 10 watts in size. If you have no experience with repairs, I'd seek a service shop that is familiar with these units. The part runs between $5-$10.


May 07, 2010 | Peavey Pv 2600 Power Amplifier

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Hi have been given a Marshall MBB15 amp to find out why it doesnt produce sound through the input jack, have checked inside, looks like the resistors connected directly to the input jack are dead. Could...

Dead resistors? The evidence would be if the resistors are cracked OR if their is evidence of smoke/fire around them.

In either case, there would LIKELY be damage at least one or two layers deep beyond those resistors if in fact they are fried. If they are cracked physically, teh circuit board also may be cracked due to physical bending. Tripping over an inpout cable can do this.

Causes of this would be shorting the input to power line voltage or the output of a high powered amplifier.

I question that the resistors are "dead".

THE USUAL cause of failures of these small amplifiers is frying of the output power chip which is often in the TDA family of 5/7 terminal amplifier chips in modified TO220 packages.

Another less common problem is failure of the rectifier and filter capacitor combination.

Nov 03, 2009 | Marshall 15 Watt Guitar Amp

1 Answer

My TP100 snare pad is very glitchy. Often when I hit it, it makes no sound at all, or it misses hits. I suspect something is wrong with the small sensitivity dial (not the big red dial), because the...

The dial could have a desoldered pin or oxydized slider contacts. Try to resolder the pins, but if that doesn't solve it then you would need to disassemble and clean the internal slide contacts on the dial which can be a bit difficult, so the alternative is to replace the dial if you can find a spare one.

To bypass the dial (with fixed resistances) you need to know the resistance at each side of the dial when it is in the position that suits your needs (connect the snare to a working input, set the sensitivity as needed, mark the position of the dial).

The resistance can be measured with an ohm meter.
To be sure that the measuring will be accurate, it is ok to remove the dial from the circuit board (adjacent components may affect the measured value).
You should do the measuring on a dial that is good.

After you've removed the dial, set it to the position that you marked previously.

Measure the resistance between left and middle pin of the dial - this will be the value of the fixed resistor which you need to connect to the left and middle hole on the circuit board.
Now measure the resistance between middle and right pin on the dial - this will be the value of the fixed resistor which will be connected to the middle and right hole on the circuit board.

Now you need to get resistors which have the values that you've measured and solder them in place of a bad dial.

It is likely that the measured value will differ from the standard fixed resistor values. To achieve the exact measured value, you can connect two or more fixed resistors in series, just make sure that the added value of the fixed resistors for each side is the same as the measured value on each side of the dial.

Now you need to solder the fixed resistors to the circuit board and the modification is complete.

If you actually decide to do this modification and you're unsure about anything, just post me some feedback, i'll be glad to help.

Anyway, hopefully it is just a desoldered pin that you need to reflux.



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