The most easy way is to return the transformer to the guy who built it and tell hem the problem. The problem can be fixed in a few minutes. If somehow you have to fix it by yourself, find a segment of the core close the winding end that is not fixed well.
Full Answer
Why do I need to replace the transformer on my amp?
This can happen when an amp is operated without a proper load, such as not having a speaker plugged into the amp or driving a different speaker impedance than the one the output transformer is looking for. Another reason to replace a transformer is to upgrade quality and tone.
Does a larger transformer make an amp sound better?
A large transformer simply has more iron, so not only are the material costs higher, the weight of heavier transformer will affect a manufacturer’s shipping costs. In regards to tone and how an output transformer affects it, it’s my opinion that an output transformer does not change an amp’s character.
How do I disassemble an amplifier?
Disassemble an amplifier: 1 Make sure that the electrical cord is unplugged from the wall receptacle. 2 Remove screws on the side, back, or bottom to separate the cover from the chassis. 3 Slide the two halves apart to expose the internal components mounted on the chassis (lower frame). More items...
What is a transformer in a guitar amplifier?
This transformer is a large blocky metal device mounted on the chassis of a guitar amplifier. This transformer converts the low current (and high voltage) signal to a low-voltage (and high current) signal that powers the speakers.
How do you fix an amp transformer?
4:2810:31How to fix Radio tube amp Transformer Hum Buzz Vibration D ...YouTubeStart of suggested clipEnd of suggested clipSo I am going to disconnect the filament and primary side I'm gonna leave the high voltage sideMoreSo I am going to disconnect the filament and primary side I'm gonna leave the high voltage side connected that allow me to just swing the transformer out of the back of the radio.
Can a transformer be repaired?
Repairing a transformer instead of replacing can substantially reduce investment costs and provide a faster turnaround than buying a new transformer.
How do you fix a faulty transformer?
1:2911:08Small Transformer Repair - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe first step after removing the transformer from the power supply was to remove the coreMoreThe first step after removing the transformer from the power supply was to remove the core laminations. This is a shell type core with eliminations.
How do you fix a buzzing transformer?
1:368:02Fixing Buzzing Vibrating Transformer Repair Amplifier ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut you can use epoxy.MoreBut you can use epoxy.
What happens when a transformer fails?
When a transformer fails, the results are a loud boom, a power outage, and perhaps even some amount of fire that can create a large plume of smoke. Since the electrical transformer is a critical link to your home's power, huge problems can result when one is no longer operating.
What happens when transformer blows?
When a transformer blows, it interrupts electrical service to any residences or businesses connected to the transformer. Electric service crews must replace the destroyed hardware, first shutting down the incoming electrical line to prevent damage and injury.
How do you know if a transformer is bad?
You can do a quick test for each winding for an open while the transformer is still connected in a circuit. Assuming you're using a cheap inaccurate ohm meter. Look for a reading of somewhere between one and about 10 ohms. If any winding reads higher than 10 ohms you have probably found a bad transformer.
How long does it take a transformer to be fixed?
A distribution transformer can take one hour to a few hours to replace; but widespread damage can take much longer to repair.
How do you test a transformer with a multimeter?
To do this, first set your meter to read AC voltage (not DC). Then connect the black lead from your meter to one of the output terminals on the transformer and use an alligator clip or other similar device to connect it securely. Next, touch both probes together and set your meter to read resistance (ohms).
What are the most common causes of transformer humming?
Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. Magnetostriction is a second source of vibration, in which the core iron changes shape minutely when exposed to magnetic fields.
What causes humming sound in transformer?
The alternation current that flows through an electrical transformer's coils has a magnetic effect on its iron core. It causes the core to expand and contract, resulting in a humming sound.
What causes a transformer to make noise?
Transformer noise is caused by a phenomenon called magnetostriction. In very simple terms this means that if a piece of magnetic sheet steel is magnetized it will extend itself. When the magnetization is taken away.
How long does it take for a blown transformer to be fixed?
Most repairs to fix a transformer will take between one and several hours. Extensive damage from storms or natural disasters can take up to several days. When a blown transformer causes a power outage, the first question everyone wants an answer to is how long it will take before electricity is back up and running.
What does a blown transformer sound like?
If the transformer “blows,” you'll likely hear a lound pop or boom sound. Your power may go out, leaving you in the dark.
Can a blown transformer cause a power surge?
A downed power line, for instance, or a blown transformer can lead to power surges, as can increased demands for electrical power during the summer and winter. And then there's the risk associated with lightning storms.
How long does it take to replace an electrical transformer?
A distribution transformer can take one hour to a few hours to replace; but widespread damage can take much longer to repair.
What Do I Need for Amplifier Repair?
If you need to open up the amplifier for cleaning or to replace a fuse or electrical cord , here’s what you’ll need:
How to clean an amplifier?
If you need to open up the amplifier for cleaning or to replace a fuse or electrical cord , here’s what you’ll need: 1 Phillips screwdrivers 2 Soldering iron and solder 3 Electrical contact cleaner spray or can of compressed air
How Does an Amplifier Work?
An amplifier is an electronic device that magnifies and controls audio signal sources from a built-in AM-FM receiver as well as an external CD player, tape player, or other audio home-entertainment device. The output signal is fed to audio speakers.
What Can Go Wrong with an Amplifier?
Many things can go wrong with amplifiers, the most common being operator error. That is, if everything lights up but there is no sound, the speaker wires may not be connected or the speaker button may not be selected. Otherwise, the cord may be damaged or an internal fuse may be blown.
How Can I Identify an Amplifier Problem?
In some cases, the problem will actually be in an audio unit that feeds in to the amplifier such as a CD player, cassette deck, DVD player, or speaker.
What to do if electrical cord is pulled?
Inspect the internal end of the electrical cord for looseness or damage caused by being pulled (a common problem) and replace as needed.
What to use to test fuses?
Use a multimeter to test all fuses.
What happens if the main power leads are no longer connected?
If the main power leads are no longer connected (you wrote, "the primary winding reads an open circuit on a multimeter") you will have to find where the wire break is located within the transformer and repair it. I don't think there's any escaping that but you might get lucky and find that the break is very near one lead or the other. If not, dismantling that transformer may be difficult. (But what is the worst thing that can happen? It breaks. And you are no worse off.)
Do transformers have thermal fuse?
Sometimes transformers have a thermal fuse underneath the black tape wrapped around the coils. You could carefully remove the tape and replace the thermal fuse if there is one. For example - http://www.electronicrepairguide.com/images/thermalfuseinside.jpg
Can you rewind a transformer?
Some transformer winding Houses offer a ' Detail Rewind service ' where they strip the core out and wind exactly the same windings with the same number of turns and wire sizes .This can cost a little more and may be worth it .Otherwise you can look at the big electro caps and multiply the volts by say .7 and use lab supplies to slowly crank up the volts checking current .You can now see if your amp still goes .If it does then its time to replace the power transformer .
What is the output transformer on a guitar amp?
The output transformer in a push-pull guitar amplifier is the last stage of the audio path before getting to a speaker— it’s one of the large blocks of metal mounted to the amp chassis (or speaker, as is sometimes seen in older amps). The transformer’s function is to convert the high-voltage/low-current signal from the amplifier’s power tubes into a low-voltage/high-current signal to power the speakers at a low impedance. It is responsible for how efficiently the audio power of an amp will transfer to the load of the speakers, and it prevents hundreds of volts (DC) from passing to the speakers.
Why are transformers so expensive?
Because transformers are the most expensive component of an amplifier, it is common for amp manufacturers to cut costs on the size and quality of them. A large transformer simply has more iron, so not only are the material costs higher, the weight of heavier transformer will affect a manufacturer’s shipping costs.
Do you need to note the wiring of an old transformer?
It is very important to note the wiring of the old output transformer. I often clip the old transformer leads and leave a little bit of the old wire so I can see the color and location of the original. Keep in mind that green or black is not always ground, and that manufacturers often use different colors for the ground. A new replacement transformer should come with a schematic, so pay careful attention to it and note the proper wiring.
Does an output transformer change tone?
In regards to tone and how an output transformer affects it, it’s my opinion that an output transformer does not change an amp’s character. A new transformer will not change an amp’s DNA or make a Marshall sound like a Vox. After all, an amplifier’s tone is the sum of all of its parts—tubes, capacitors, wiring, speakers, etc. If you were to run clean water through an old, dirty water filter, you would ruin what the water had to offer before being filtered. It would still be water, but changed in a way that detracted from what it could have been. The output transformer plays a very large role, but is not everything in shaping an amp’s tone. Upgrading it takes what the amp already is, and then enhances it. Physically larger output transformers generally sound larger, since they have a larger window for tone to flow through. Tone is usually clearer, fuller and truer.
Why do you need to replace a transformer?
Another reason to replace a transformer is to upgrade quality and tone. Because transformers are the most expensive component of an amplifier, it is common for amp manufacturers to cut costs on the size and quality of them. A large transformer simply has more iron, so not only are the material costs higher, the weight of heavier transformer will ...
Why do you need to change the output transformer?
There are different reasons why a person would want to change their output transformer—the most obvious being a blown or damaged unit. This can happen when an amp is operated without a proper load, such as not having a speaker plugged into the amp or driving a different speaker impedance than the one the output transformer is looking for. Another reason to replace a transformer is to upgrade quality and tone. Because transformers are the most expensive component of an amplifier, it is common for amp manufacturers to cut costs on the size and quality of them. A large transformer simply has more iron, so not only are the material costs higher, the weight of heavier transformer will affect a manufacturer’s shipping costs.
What is the output transformer on a guitar amp?
The output transformer in a push-pull guitar amplifier is the last stage of the audio path before getting to a speaker— it’s one of the large blocks of metal mounted to the amp chassis (or speaker, as is sometimes seen in older amps). The transformer’s function is to convert the high-voltage/low-current signal from the amplifier’s power tubes into a low-voltage/high-current signal to power the speakers at a low impedance. It is responsible for how efficiently the audio power of an amp will transfer to the load of the speakers, and it prevents hundreds of volts (DC) from passing to the speakers.
What are the different mounting styles for transformers?
There are three basic mounting styles: vertical, horizontal, and flat. Vertically mounted transformers sit taller than they are wide, with the laminates in a vertical position and the end bells positioned perpendicular to the chassis.
Does an output transformer change an amp's tone?
In regards to tone and how an output transformer affects it, it’s my opinion that an output transformer does not change an amp’s character. A new transformer will not change an amp’s DNA or make a Marshall sound like a Vox. After all, an amplifier’s tone is the sum of all of its parts—tubes, capacitors, wiring, speakers, etc.
Is a transformer ground green or black?
Keep in mind that green or black is not always ground, and that manufacturers often use different colors for the ground. A new replacement transformer should come with a schematic, so pay careful attention to it and note the proper wiring.
Do you need to note the wiring of an old transformer?
It is very important to note the wiring of the old output transformer. I often clip the old transformer leads and leave a little bit of the old wire so I can see the color and location of the original. Keep in mind that green or black is not always ground, and that manufacturers often use different colors for the ground. A new replacement transformer should come with a schematic, so pay careful attention to it and note the proper wiring.
What is the output transformer on a guitar amplifier?
The signal runs through the output transformer before exiting the speaker. This transformer is a large blocky metal device mounted on the chassis of a guitar amplifier. This transformer converts the low current (and high voltage) signal to a low-voltage (and high current) signal that powers the speakers. The output transformer literally transforms, or transfers, the audio power of the amplifier onto a load (impedance) of the speaker; how efficiently it does this is one measure of quality and the modernity of technology and materials used. The speaker is thus driven, and literally transforms the signal from electrical into vibrational-mechanical signals through the air.
Why change out power transformer?
There's a lot of iron in a power transformer, so these tend to be the most expensive part in an amp and thus can potentially be the weakest link in the signal chain that contributes to quality and tone…. if manufacturers skimp on the power transformer (which equates to less iron, less cost, less weight, and lower shipping charges.) Another reason to change out a power transformer is to fix damaged that can be caused by gross under loading and impedance mis-matching, among other things. Note that power transformers can carry dangerous levels of electrical power, so careful precaution in replacing one is not only smart, but can prevent serious injury or even death.
Why use a resistor in guitar amplifier?
Some guitar amplifiers use a resistor instead of a choke to accomplish similar results and to save money, but a resistor doesn’t eliminate as much AC ripple as a choke. This causes additional residual hum in the amplifier, so a choke is a better choice if quality of sound is a concern. Part Number.
How to fix transformer buzzing?
To solve transformer buzzing caused by DC offset, you need a specifically designed power strip that eliminates DC offset. These kinds of units are not easy to find. Originally, PS Audio made such a unit called the Humbuster III.
How to fix DC offset?
Typically, you can try and debug DC offset issues by going to your house’s breaker and turning off one breaker at a time. The buzzing will stop once you turn off the breaker with the offending culprit. Hopefully, if you’re lucky, you can find the specific breaker that causes the problem and then find out what electrical items are on that breaker and narrow down what’s causing the problem and remove it.
How Can I correct DC Offset?
This is due to the simple fact that something in your house is causing the DC offset in the first place. So, for example, if it’s the microwave oven light, you’ll only notice it when the microwave light is on. If it’s a particular dimmer or set of dimmers, then you may notice an increase in the buzzing loudness when that combination of factors happens. In case you’re wondering, having your audio equipment on a dedicated circuit or breaker won’t prevent DC offset issues.
What does it mean when your audio is DC offset?
The typical symptoms of DC offset are an audible buzzing or hum from the audio equipment chassis. It’s important to note that DC offset-induced buzzing will not emanate from the loud speakers. Specifically, it will be the power transformer inside the equipment that will be buzzing. In most instances, it will only come from ...
What causes DC offset?
The usual suspects that cause DC offset are household dimmers, microwaves, and switching power supplies. Switching powers supplies, which use half wave bridge rectifiers, draw current in uneven pulses. It’s these uneven pulses that can cause large transformers to vibrate and buzz or hum.
Why does my speaker buzz?
When the buzz is coming out of the speaker, it’s often related to a ground issue with the electrical setup. When the buzz is coming from an audio component, it’s oftentimes more difficult to diagnose. We’re going to cover a specific issue called DC offset that typically affects the power transformers in your audio equipment and makes them buzz.
Why does my home theater sound like a buzz?
When the buzz is coming out of the speaker, it’s often related to a ground issue with the electrical setup.
