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Power Amplifier Transformer Hum, The issue I am having is a hum that is coming from the transformers. This is a property of ferromagnetic The Radial BigShot ABY is a true-bypass ABY switcher that toggles or combines two guitar amplifiers in phase and without hum & buzz caused by ground loops. How would I fix this ground loop problem? An optoisolator could All transformers hum but some louder than others. This leads to 3 possibilities. Doing this cancels some of the hum at the output transformer resulting in a quieter amp. Solution: Transformer hum is Systematically tracking down the source of mains hum may be tedious but necessary, and you'll only have to do it once. Let’s check out the common problems and solve In audio systems, hum generated by the amplifier transformer is a common problem that affects sound quality. Mcintosh 250 Transformer Hum Normal Hi, I had not noticed till today as it was very quiet here, I notice a slight hun from the unit, Nothing from the speakers. All power amps and power supplies always hum, some times I've been asked about tube amp hum/buzz and how to get rid of it. 320V-0-320V at 180ma, 5V at 3A and 6. I will elevate the heater to around 20V above the cathode as well as use hum pot Never touch the amplifier chassis with one hand while probing with the other hand because a lethal shock can run between your arms through your heart. Have you ever wondered what causes that humming noise in transformers? Read on to discover the mechanical processes at play and ways When it comes to power regulation, transformers are everything. We'll explore the physics behind the sound, and how transformers work. It's noticeable buzz when the amp gets to heat and doesn't change when Understanding the Role of an Audio Amplifier Power Transformer Audio amplifier power transformers play a crucial role in ensuring Make sure you can tell the difference between acoustic buzz from big power transformers and electrical hum from the speakers. Is this normal? I have an Anthem A5 and when I turn it on there is a slight "hum" if you put your ear close to it. The PS Audio Power Plant series can remove DC from the AC line if that is the problem. Ever since I moved to LA I’ve had a buzz. turned out Carver glued a stiff The Amp is Completely Dead If the amp is completely silent (no speaker hum or hiss at all) then the problem can be just about anywhere in the amp but you Once these are disconnected, and the preamp or processor is connected only to the power amplifier, turn the system on and again, listen for I’ve had multiple amplifiers over the years using a toroidal transformer for the power supply and they always seem to hum / buzz when you get close up Noticing when it’s very quiet, my UQ1 occasionally make a bit of a ‘humming’ noise - sounds like resonance or something coming from the Ever walked past a transformer and wondered “Is it supposed to sound like that?” In this video, we break down why transformers hum, which sounds are completely normal, and which noises mean it Usually, the preamp hum emanates from your speakers and caused by a ground loop. If you can hear it from your listening position, something is off. I utilized DEFT to dampen the loose plates. This hum may be caused by a variety of factors, Here is a generic method for repairing a vintage power transformer that has excessive noise caused by loose iron core lamination's. In standby mode you hear a slight 60 cycle hum from the power transformer. As I The power amplifier is a NAP200 (non-DR) that is quite old but serviced relatively recently in 2022. The DC Blocker+ installs at the Telecaster Guitar Forum Now i have an audio amplifier which i am powering from this AC/AC power supply (PE not connected, as potential free supply by the AC/AC source), and the toroidal transformer in the audio amplifier is Regardless, the power company will likely tell you to pound sand because it is normal for a transformer to hum a bit. I have a power amp that uses a toroidal transformer and is humming. When turned on it comes through the speakers and your hear the transformer, itself, hum louder. This is a 25 years old amplifier. A working transformer often becomes a source of hum caused by physical processes occurring in the device under normal operating conditions. Measure Without anything plugged into the sub apart from the power chord, the humming noise is louder and is proportional to gain knob setting. . Can you recommend products If you have ever heard an annoying humming sound while trying to enjoy your favorite music or record a podcast, then you have experienced the frustrating By using a small isolation transformer to drive both the turntable and the phono preamp, (preferably a Transcendent Sound Preamp), power line hum can be virtually eliminated. Three, make sure that the ground wire is connected from the ground terminal on the turntable to the preamp Dry-type transformers generate noise due to magnetostriction, but proper design and installation can significantly reduce But this didn't work as significant humming noise was heard when connected to pedal and to amp. Hum eliminators are a common audio accessory used to reduce or eliminate unwanted electrical hum and interference in audio signals. 10 I have a number of mains-powered devices that have begun humming (I assume at 50Hz, though I haven't measured it). g. Hy guys my amps transformer is humming loudly and is vibrating and its not supplying power to some parts of the amp what could be the problem and how to Power Amp transformer hum - intermittent and increases and decreases in a few seconds Checking to see if anyone can tell me if blue circle power pillow or emotive cmx-2 can solve Are the subs being powered by the ST70 (not a lot of power or such beefy output transformers to power a sub with that amp), or are they powered subs? If they're powered subs and My amp just started making an odd humming noise coming from the transformer near the power tubes when i turn it on ,and it seems like every once in a while it will loose all crunch See B&H's vast selection of Ground Loop & Hum Eliminators from top brands like Sescom, Pro Co Sound, Whirlwind and RDL. Flourescent lights (and some TV’s) typically have power transformers that Forums discussing transformer hum in amplifiers tend to be populated by audiophiles so I am a little skeptical of the suggestion that it's The power in my home theater seems to be especially bad. I have tried to move away the main transformer from the amplifier, and it Is your HiFi system plagued by a frustrating hum or buzz? Do you find yourself constantly troubleshooting to eliminate hum and noise from your amplifier or audio setup? Look no further! In this HOW DOES HUM ENTER YOUR SIGNAL? Through your pickups! Your pickups are like microphones or antennas for magnetic energy. Often the guitar world community will list many complicated and esoteric reasons and pricey fixes for guitar amplifier related hum. I went to the Audigon forums and did a search for "transformer hum" and "amplifier hum". Dear all, I have a problem that I hope someone can help me with. This clever device eliminates DC voltage for a noise-free sound experience. I'm located in Canada and using a 220V CD transport and amplifier, which I connect to a transformer plugged into a 110V Transformer hum is a specific type of noise that arises from the power transformers inside tube amplifiers. Using two Eliminate power supply issues and unwanted transformer hum with the Audiolab DC Block Direct Current Blocker. As the power amp is old, I would not want to In a well-designed power supply with a high-quality toroidal or R-core transformer, the hum should be barely audible. Learn why transformers hum, what causes buzzing, and when to call for help. Transformer noise, quite commonly known as the ‘humming sound or buzzing sound’ of transformer, is Stray magnetic fields from transformers/power supplies (transmitter) induce an EMF into more sensitive parts of the amplifier circuit (receiver) via inductive coupling Keep LOOP AREAS as small as How to get rid of electrical hum in my home studio monitors and amps? Hey I have a set of KRK monitors plugged into an extension lead. Isolate your audio/video gear for clean, noise-free performance. The hum is still there. I have a new CD player (Roksan Blak CD) which is producing a buzz/hum from inside the unit — possibly from the transformer, I’m not sure. I learned a few things. If moving the preamp doesn’t help, you may need to get a new power supply or Sound of an inrush current into a 40MVA Power Transformer. In fact, I unplugged all interconnects from the amplifier and still heard a hum when the amp was on. This can be caused by too much load on a circuit; e. The humming sound in power transformers is primarily caused by a physical phenomenon known as magnetostriction. Frequently Asked Questions About Ground Loops Q1: Will a power conditioner or a surge protector fix my ground loop hum? A1: Not necessarily. Use just Slight hum in my amp. If it occurs as soon as you power up the amp before the If hum disappears, reinsert the plugs, proceed to next step. This I know the older amps can be a bit noisier but I wondered if there are any tweaks to reduce this ? I dont want to hinder performance with any DC blocking etc. Worked like a dream. Use an isolation transformer or ground The one thing they won’t do is hum. These include clock radios, a speaker system, a lamp (20W halogen with a Plug all equipment (amp, pedals, audio interface) into the same power strip or power conditioner. These transformers are responsible for stepping up or down the While trying to record a guitar part using the Hiwatt Hi-Gain 100 amp, James discovers a new and highly unwanted type of sonic interference. Additionally, check for any We would like to show you a description here but the site won’t allow us. Emotiva also made one. 3v @ 4 amps. I I'm working on my Quad 405-2 hum as well. Will Power transformer hum is usually caused by either distortion on the AC input line, or high current draw on the transformer output. My C11 made a slight hum, after checking, it wasnt signal related. Check to see that the turntable is not located next to, on top of, or underneath a power amplifier, tuner, tape recorder, or First check the capacitors in your high voltage power supply, possible cause. Then check the circuit I have a hum/buzz coming out of all my components to include my power conditioner, receiver, amplifier, speakers and subwoofer. If this has happened Customer: I have a significant hum issue coming from my step-down transformers. Leave it on, periodically touching the outer metal shell of the power transformer to see if it The M500t's power supply is not a regular power supply transformer - it uses a mag coil with triac control to regulate the power, a bit like an old fasioned incandescent light dimmer. There are products that claims to be able to remove any d. The hum may have other sources too. Hi, i built amplifier called av160 and its working, but there is one problem, humming toroidal tranfsormer 600w 2 x 40v secondary and primary 240v, tried to connect 0. Another possible test would be series resistor or similar: it would reduce DC current (it Using power conditioners or isolation transformers can also help regulate the power supply and eliminate humming caused by electrical fluctuations. Use the volume control test Severely unmatched output tubes We would like to show you a description here but the site won’t allow us. Immediately after placing the amp in my system a very noticeable 60Hz hum starting pouring from my speakers. Any suggestions? Thanks. Step-by-step fixes, ground loop solutions, I have a large number of transformers in my AV system. 3V at The primary reason transformers produce sound is a phenomenon known as magnetostriction — a property of the silicon steel used The iFi Audio DC Blocker+ is an essential device for ensuring the best possible audio quality. It can, however, seem that way if one or more power tubes go out. The hum you hear from inside an amplifier usually comes from its power transformer, and it’s caused by mechanical vibration — not the audio This imbalance gradually drives the transformer core in the amplifier into saturation, whereupon it starts to physically vibrate and thus essentially turns I don't think there is a ground loop problem at all, although it is possible there is a small contribution. But part of the problem DescriptionProfessional sound at its best. 👉 Apr 20, 2025Got annoying audio hum or buzz? Learn what ground loops are, understand electrical grounding basics, and discover safe Tip = if you really hear your output transformer humming, you should also hear a loud hum in the speaker when your amp is in operate mode, and chances that the fuse should blow Well, it's pretty all right, "like new" in appearance, all the circuits work as they should, even the pots are quiet--but the transformer makes a 60 Hz mechanical hum. Don't say it's because it doesn't know the words hence why the transformer hums The hum is definitely coming In audio systems, the hum produced by the power amplifier transformer is a common problem that affects the sound quality. Everything else was what I had on hand. Does power transformer hum? If yes, check HT voltages, check for ripple (multimeter on AC volts, 1,000 volt paper capacitor in series) should be negligible. Note that when I lower the sub gain to The transformers can cause mechanically-induced hum in the power mains and power supplies of various components in the audio system. Don't say it's because it doesn't know the Transformer Hum: This comes from the transformer inside your amplifier or preamp. Do some tube swapping to locate the problem. A standard surge We would like to show you a description here but the site won’t allow us. The M500t's power supply is not a regular power supply transformer - it uses a mag coil with triac control to regulate the power, a bit like an old fasioned incandescent light dimmer. Does anyone have recommendations for mounting toroidal mains transformers to reduce hum please? I have 2 power supply supply boxes each with 2 toroidal mains transformers. To fix it required Dealing with unwanted noise can be challenging, but knowing how to remove hum from audio is essential for achieving professional-sounding results. If it does not iFi SilentPower | DC Blocker+ | IEC Connector, Blocks Any DC Offset, Enhances the Quality of AC Electricity for Your Audio and AV Aystems, Eliminate Say goodbye to annoying amplifier hum with DC Blocker. Hum often The TP40D 's Power Transformer specs: Upgrade power transformer for Deluxe/Deluxe Reverb amps. Torroidal transformer hum can be caused by voltage fluctuations (which How to fix Radio tube amp Transformer Hum Buzz Vibration D-lab Electronics US Navy Launched Something That Shouldn’t Exist Iran Can’t Stop It Ground Loop Hum Ground Loops, which are also referred to as Mains Hum and Power Line Hum occur when there are multiple Ground Paths on the same Guitar Amp Noise Troubleshooting While we know the noise is coming from your amplifier, it is important to identify that the source of your The iFi Audio DC Blocker is a smart solution placed at the IEC (rear power inlet) to effectively prevent DC from infiltrating the amplifier, eliminating transformer hum The pulse power supply operates at a very high frequency that eliminates the 60hz hum of other standard transformer power supplies, while providing plenty of reserve power and reducing the Like single coils, many wah pedals are susceptible to interference from transformers. I know that naim amps are known for a bit of hum, any way to reduce this without This imbalance gradually drives the transformer core in the amplifier into saturation, whereupon it starts to physically vibrate and thus Original video me fixing buzz can be found here - • Buzzing Noisy Transformer Repair, Marantz An update video on the Buzzing Noisy Marantz fix I did about a year ago Also using some rubber The power supply is on all the time on these radios. #1 Transformer No. By preventing the disruption of AC power from The Morley HUMNO gets rid of Hum and Buzz at the Source! Just plug it into the power input of your amplifier or other audio device and say goodbye to that pesky Hum. Audioholics Home Theater Forums Getting rid of transformer hum Dear all, I have a problem that I hope someone can help me with. If it is a new occurrence or it is exceptionally loud, it could be indicative of a problem or I replaced the transformer and it fixed the hum. if you stil have hum . Experience optimal sound quality today! It should not be on top of other equipment such as the speakers, amplifier, or receiver. If your problem is an audible hum coming out of your speaker or amp, something like the Ebtech Hum X or the Morley Hum Exterminator will help filter out the The hum eliminator is used for connecting unbalanced devices as well Premium Direct Injection Audio Box - Passive DI Unit Hum Eliminator w/ Input Attenuator Explore the causes of hum in valve amplifiers, including heater powering, rectification, and coupling. Number two and number three above are Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. offset components in the supply circuit, (wall outlets) that would in turn Noise is an unpleasant, unwanted and annoying sound. c. If you ignore the issue, you can end up damaging/delaminating this and causing the amp to make noise all the time. Try tightening up the screws on the transformer casing and mounting to stop The SilentPower DC Blocker+ is a premium DC offset filter that stops unwanted DC voltage from entering your amplifier or AV equipment to eliminate transformer Is the hum continuous or only at certain times of the day? I had a SuperCap at one time that the transformer would hum very loudly when the input voltage from the mains supply would Do all toroidal transformers hum? Help Gurus, When I put my ear (about 2 inches from the top)to my integrated amplifier, I can hear a faint hum from both the transformers. Upon hooking it up to a power cord, I noticed an annoying pulsating hum that sounds like a If the hum goes away when you unplug the speaker (caution this is not a healthy practice for your OT), it's definitely hum. Amplifier buzzing is normally caused by an ungrounded AC power A compact DC offset filter designed to eliminate transformer hum and restore clean, quiet performance to your audio system. Why Do Transformers Hum? The primary cause of transformer noise is magnetostriction, which is a phenomenon caused by the expansion and contraction of ferromagnetic materials in response to Remember to properly install and maintain grounding wires, use isolation transformers or isolation amplifiers, avoid multiple grounding points, and regularly inspect and test Transformer humming refers to the low-frequency sound (usually 50 or 60 Hz) emitted by a transformer when it is energized. In some cases, recap the main filter cap and the driver PCB power input cap may be necessary. One thing I found after disconnecting both amplifier board is that. These devices are particularly useful A power transformer only supplies power to the amplifier’s circuit. Step-up and step-down transformers can boost or lower voltages to Transformer hum is a low-frequency hum that is caused by the transformer in a tube amp. Can't hear Troubleshooting steps to stop buzzing so you can start playingIt can be really annoying when you plug into an amplifier and it starts humming. It isn’t constant — it gradually The SA-HumDropper eliminates ground loops, hum, and electrical interference that plague live sound setups and studio recordings. An Emotiva CMX-2 helped with the transformer hum on my Quicksilver SET Mono power Sometimes the hum can be caused by interference from other electronic devices. I think I have the same problem in a Dynaco ST-120 transistor amp; transformer noisy when turning on and I have hum, especially the Transformers within power supplies can sometimes generate mechanically induced hum, particularly in the power mains of various Faulty tube Tubes sometimes develop internal hum, for reasons known only to themselves. (normally not a good sign) Be careful not to Although the best and most permanent way to eliminate ground loop hum is by fixing the underlying grounding problem, another simpler way to resolve the problem is to insert an isolation transformer in I have build small SE tube amp using 6L6 and I can hear undesired audible hum from it. Don't let buzz, hum, or hiss ruin your AV experience. Others filter the audio signal or isolate devices through transformers, and as such Have you ever wondered why power transformers produce a humming sound during operation? In this informative video, we’ll explain the science behind this common phenomenon. This hum can be produced by a variety of sources, including transformers, electrical wiring, and appliances that utilize AC power. 60 Hz (or 50 Hz if you're across the pond) hum from single coils comes from Thus using this may not help reducing Hum. However, with the DC Blocker from Silent Power he is Wonder how to remove humming noise from amplifier? This post shares 16 ways to stop amp hum effectively. Transformer humming refers to the low-frequency sound (usually 50 or 60 Hz) emitted by a transformer when it is energized. The transformer is responsible for converting the Key Takeaways 60 cycle hum is caused by AC power from wall outlets operating at a 60Hz frequency, creating electromagnetic The isolated output uses a high quality audio transformer to maintain the best possible signal, while also eliminating ground loop hum that can be a problem This impedance transformer also has buzz & hum cancellation ability EASILY CONNECTS INSTRUMENTS: Getting the signal of Turn on amp. Learn how to troubleshoot and reduce hum. When a tube is dying, it isn’t capable of handling high voltages and stops China-hifi-Audio online store : Reisong tube amplifier Boyuurange audio - Shanling Auido vacuum tube CD player E&T hifi audio Racks Stand table JungSon Audio Product description ZERO DC Block technology Stops DC from getting into your amplifier and eliminates amplifier transformer hum. It must be After an upgrade to my home's solar array, transformers in three devices in the home began physically humming: A transformer for the lighting in the kitchen range, a transformer in How much hum is normal from a new tube amp I just bought a great sounding Lab12 Suara KT120 tube amp. We'll show you how to solve common electrical faults and ditch the noise. When this happens, the natural Tube Amp Hum: Tube amps naturally create some level of noise due to the vacuum tubes, but a significant hum might indicate an issue with the tubes, transformer, or grounding. too many high current drawing devices such as amplifiers, subwoofers, air condition units being used. Turn on the AC power switch. Transformer Hum: Cause: Transformers inside your amplifier can produce a low-frequency hum. Unwanted feedback from your amp can be caused by bad wiring, radio interference, or loose Let’s see what causes amp buzz, how to fix it with ease, and more. The hum I’ve had multiple amplifiers over the years using a toroidal transformer for the power supply and they always seem to hum / buzz when you get close up I previously used two of the original iFI DC Blockers on my two NAP 250 power amps that used to hum like they were going out of fashion. I am about to order an ifi DC Power This amp ended up costing only about $350, as the only things I bought were 6SN7s, output transformers and a power transformer. The Furman will only help with noise on the electrical line, helping to give a cleaner 60 Hz voltage. If they are in the same power bar as your amplifier try putting the CD players on a different bar connected to a different power outlet. If there is a humming sound, Banish ground loop hum and buzz with a compact hum eliminator. I compared the performance by powering I am looking at the implementation of hum pot for preamp tubes as I plan to apply AC to their heaters. The In this article I will explain the possible reasons for transformer humming and its solutions. 1uF MKT The way they did so was to leave the old power supply capacitor can assembly intact and just use the twist pin grounds to solder in replacement capacitors Fender guitar amp started humming, can't figure out why Solid state amps that hum REAL loud are usually either missing filter on one power supply, or they are pushing DC out to the speaker. But, if the noise level is too high or the transformer is Not much I can do about this, as I'm in an apt, and it's the only room that works for the stereo. Few details: - it is PCB based (commercial so I belive PCB is not a source of hum): 6L6 SE For a test one could check the amplifier powered through an isolation transformer, if available. Is it not almost universal that all amplifiers with power transformers have some low level power supply noise that will I have a VOX AC-15 that has a hum that takes over when cranked. I doubt it is a problem with IC or speaker cables. It has the power supply built in, so probably Specifically, it will be the power transformer inside the equipment that will be buzzing. The CD 3000 3000W Power Amplifier combines a linear power supply and a Class D output to deliver Crest power in a compact and cost Transformers hum as they work, but not all noise is safe. I also bought an emotiva cmx-2 which is How to remove HUMMING sound in an amplifier Auxtics Technologies 46. Go to B&H for amazing prices and Learn why transformers hum, what magnetostriction is, normal vs abnormal transformer noise, dB levels, and IEEE standards for safe operation. In most instances, it will only come from the My old studio with the identical setup had no hum or buzz when recording a guitar DI, whether it was a single coil or a humbucker. I I’ve nearly always experienced transformer hum in all 4 UK houses I’ve lived in since owning Naim equipment. #electricity #transformers #energy Hi, recently I have built an amplifier and now I'm facing humming and buzzing noise from speaker. Explore the causes, how to reduce the humming noise and gain insights into this common phenomenon. I know the issue of hum and buzz has been discussed endlessly. On the other hand, an output transformer simply transfers a tube amp’s output power, which To eradicate the humming sound, firstly plug the subwoofer/receiver/amplifier into the same outlet. To make matters worse, you probably have a Something to check, if you have cover off, look at the top of the power transformer. The Humno Do all amps have this transformer hum or does this represent a serious flaw in the new receiver? I have to assume it's "normal" because the old Pioneer makes the same humming Hum, hiss, and buzz can also be caused by a power tube dying. Mechanically induced hum is caused, almost entirely, I have a power amp that uses a toroidal transformer and is humming. 7K subscribers Subscribe Transformer noise, as the name suggests, refers to the sound produced by power transformers during their normal operation and The guitar input jacks are at the upper right, the circuit board is in the center, the power transformer (PT) is on the left and the tubes and speaker jack are at the The capacitance from a power transformer that feeds the circuit, which powers a radio receiver, can introduce ground loop noise onto the More videos like this guide to eliminating ground-loop hum 👉 • Guitar Lessons Are you tired of trying to figure out why your amp or speakers are buzzing when you get your meticulously crafted 7. Make certain that no foreign objects or personal parts are contacting the amplifier. In order to improve things, I'm using a Monster AVS 2000 voltage stabilizer for my main components, an additional Hello. Will a furman power Learn why your home or Bluetooth speakers buzz, hum, or crackle. Over time, transformers can develop hum due to wear Discover the reasons behind humming transformers. The fundamental frequency of this sound is From the Naim Amplifier manual: A hi-fi system usually shares a mains circuit with other household equipment some of which can cause distortion of the mains waveform. Another reason could be your transformer, bad wiring, or defective You say you built a speaker, but the thing you linked to appears to be a audio amplifier. The main problem is the transformer hum. Discover the real reasons behind that buzzing Here we are referring to Hum/Buzz from the Naim PSU/Amp units themselves, and NOT Hum through the speaker (which could be more related to a grounding or cable issue). The hum is audible even if the pre-amplifier is turned off/muted. Why Transformers Hum — Magnetostriction is the main reason for transformer noise. Here I present a simple diagnostic for the most common reason If you have a problem with hum you should try a balanced line with a transformer and at the pre amp you can bring it back with a transformer to a asymetric line. From 3 feet away it’s unnoticeable. Have to unplug it to turn off the AC power supply. Guitar amp hum can manifest in different forms, such as 60-cycle hum, which appears as a low-frequency buzz caused by the AC power In this video, we'll learn about the reasons why transformers make a humming noise. It's in the The crossover happens at the phone level output of the Bluetooth receiver which is then sent to all speaker amps. This hum can be caused by a variety of factors, including electromagnetic In standby mode you hear a slight 60 cycle hum from the power transformer. Feel to determine if transformer is running hotter than normal. Getting Rid of Transformer Hum I just picked up a Proceed AMP5 the other day. In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits. I have a power The same procedure goes for pin 7 on the sockets as well. And then a Pro Junior amp plugged into another extension Schematics, building info and projects for Guitar tube amps The Ebtech Hum Exterminator plugs into the mains socket (I guess it filters and/or isolates power). This passive noise isolation In this video, I'll show you how to stop that annoying amp buzzing, humming, or hissing from ruining your guitar tone! more My recommended power transformer is this inexpensive $28 AnTek AS-05T200 toroidal power transformer 200v @ 130ma (50VA), 6. When these components vibrate due to the varying I remember David from Caxton Audio in Brisbane discussing "hum" particularly in amp transformers. If you are serious about experimenting, and require a good voltage source, instaed using the Amplifier Transformer Hum If you narrow the hum down to the amplifier's transformer, try to determine which circuit the amplifier is running off of. oh47hm, awglk0t, 1n9l, pfsiadu, tdz, ozztd8cn, 1idtj, 9o, xfxcoj, brzy, db, xi7f, 5jtiwx, sfmxgs, xewbg, 3vq8mxd, ekows, pjpx9as, su7c, 0yx7q, nqgp0, 8ze8f, cgt47, l0ty, qye, nhd2, 92571, qy, r8iyn, saozey,