The coaxial cable was the problem. It is my understanding that metal could be the issue and it does seem like my studio has metal sheets behind the walls. Hi Paul, I had an issue with my Kenwood series 21,its a vintage system about 20 years old. I tried to connect the amp using my pre-amp out but this leads to the hum being heard in the next room and the volume control can barely be used. Noise from microphonic tubes will typically increase with a volume increase. Now I don’t have to :p Ground loops are common when video equipment is connected. 2. You can also subscribe without commenting. CDs play fine, but there is a low (possibly 50-60hz) hum on the FM Radio – which is louder at the lower end of the FM band – 87-97 Mhz. Ive done many experiments to isolate cause. meters each. I’ve tried to isolate each outlet and it doesn’t change. And other times it will come back even without turn everything off and on again. A few of the LED lights I installed in my home theater had such powerful RF radiation it stopped my garage door opener from functioning. It could be the driver tube, the filament may have shifted from age/use closer to the plate, which can cause line hum. Poor quality pedal boards, FX units or even guitars will feed noise into the amp that will be exponentially amplified. This hum is fairly low but still can be heard from the listening position ( 10 ft from loudspeakers) only between songs. When I disconnect the HDMI inout form the Cable Box into my receiver, the humming (60Hz) stops. I have disconnected one by one each equipment, no clue came up. Hi, I’ve inherited a Bose Wave Radio/CD unit in really good condition. I’ve isolated the hum to the HDMI going into my cable box. 4. I don’t know if its a javascript setting or what. If I connect to the pre-amp I will have to leave the amp volume at one position and use the preamps to control the volume. This amp was recapped in March or so and has only been played about 6 times since then. Thanbks. If the hiss subsides when you turn your guitar master volume down. I’ve also replaced the electrical wiring feeding the equipment, so there is a single ground point all bonded together. I have a slightly different situation. It is there even with no preamp connected to its output! In my old house both receivers didnt get any hum. I’ve added some recordings of both types of hum. I also have a speaker plagued by hum – an active speaker (a Focal Solo6 Be). Anything else I could try? Is there something I can put in-line with the RCA connection that will pull out the hum? A faulty, humming preamp tube can be isolated this way very quickly. ... Bad caps, especially in the power supply, are the first place to check. Thanks Paul! Hi, I have my surround system connected to TV (via optical cable). I read that an on-line uninterruptible power supply might help, as it provides clean power, but I’m suspicious, as I ran an extension cord from my home to my shop [they each have their own electrical service on separate meters] to see if “clean” power would help, and it did not. Loosen the hold down bolt for the power transformer and, with the unit on and connected to speakers so you can hear the hum (nothing else connected to the phono preamp) rotate the transformer and see if that helps. A good way to divide and conquer is to turn the volume control(s). If I stand 5 feet Tom the speaker I hear it with the volume all the way down. I would get it serviced. Thanks and I really appreciate your long lasting support (since 2015) to the comments for this article! I think you are going to have to experiment to see which sounds best. If another set of cables still hum, then there’s likely something wrong with the CD player. Nothing has changed in the house during that time. Changing the input does not stop the hum It works just fine when the laptop is unplugged and running in battery. Thanks for the reply…that’s what I was worried about! I have been trying to resolve it for a couple years now. Does the hum go away? My name is Indrajit. My speakers sound good when I listen to the FM radio as there is no hum and the sound quality is excellent. I have had it serviced and it’s just awesome. I had a humming noise coming from my TV speakers for a while, well really a long while. 4. It is a little like the hum that you might hear near one of those large transformer power stations, but obviously much louder. I assume if you disconnect the speaker cables the buzz stops? I could hear the "swarm of bees" from 15' away. 3. The VS-115 is connected directly to a different dedicated circuit. Hiss is caused by high volume settings, high gain settings or bright EQ settings. but the hum wont go away! Is that correct? So I don’t think it’s a ground loop issue, any other ideas? Any suggestions as what might be causing the issue and how to proceed would be welcome. Hi, thanks for the post. The hum was louder then ever. 5. Thank you, What might cause a 60Hz hum in only the passive tweeters in my tower speakers (DefTech BP9060), only when the receiver (Denon AVR-X6200) is powered OFF? Once I swapped the cable the annoying buzz/hum went away. I purchased a rare amp from the 70s from a friend. If that is all true, then your receiver is probably ok. Use an isolation transformer for the antenna and it should solve your problem. I can see by the picture of the model you have there’s a toroidal transformer in the rear and on top of the unit. I am guessing you’re in need of a new table? The amount of hum increases the closer I get. Each Set of speakers is connected to a mixer, and the mixers are connected to laptops. Connect the preamp this time making sure the preamp hasn’t any source connected to it at all (mute doesn’t count). Hi Paul, I have an AVR Denon 4500 with a speakers system 7.1 If you have the receiver and speakers connected but nothing else, including the CD player, then switch to the empty input where the CD player would go. It works well (no humming etc) when I run you tube on smart tv, great sound. Try the Jensen transformer https://www.amazon.com/Jensen-VRD-1FF-Digital-Isolator-Jensen/dp/B00AQV04FE. HumX = hum All cables (audio, HDMI, optical, RCA, electrical) are new and premium, those audio, mostly QED. I actually just had this replaced a month ago because the one I purchased in April had a similar issue but was much more persistent and annoying. Other than that the equalizer seems to work fine, and you are able to adjust the sound and all. Just recently upgraded my A/V receiver. Another “expert” told me I could use special isolated cables but that that’s not worth it as they are extremely expensive (like 300 euros for 2 meter length). No clue where to go from here. FINALLY!! RCA Aux-In: Amazon Echo Dot. I have tried all combinations, phono+preamp+power amp, phono+preamp+headphones on preamp, phono directly connected to power amp, I have used balanced and unbalanced cables to no avail. Is hum something I need to live with? I have tried to connect a seperate ground from chassis to ground and no change. You’ll need a better quality LED light to fix this problem. However graphic equalisers for this system are quite rare and I want to keep it in case of problems in the future, what I want to know is does the G.E need to be looked at by a specialist or will fitting an RCA ground loop isolator to the G.E outputs resolve the issue. 3. The answer to all three questions is no, so I am wondering if a ground lift is the best / only solution? Don't subscribe Generic Guitar Tube Amplifier Modifications. Happy New Year! The turntable has a built-in preamp. Could this be a power line issue? I have disconnect all other inputs. Again, thank you so much for all the help. Thank you for all your help with this! HIGH PERFORMANCE HOME AUDIO PRODUCTS Any pointers would be appreciated. My audio system is perfectly quiet even when the monitor is switched on. Here’s a great example of when to use a 3-prong to 2-prong AC cheater plug on the laptop. I have vintage Pioneer equipment. Hi Paul – it looks like you are helping out a lot of people, but I don’t see my particular situation addressed, and I’ve read all over that a lot of people have the same issue. I've recently got hold of a Cyber-20 tube headphone amp. Once determined you can either replace that piece of gear or read our extended hum fixing guide for further instructions. So I turned off all my ad blockers and perused your site because I was so stoked. Thanks for this how to note. cart. When I engage the tape monitor button on the equalizer, I get the 60hz hum type of sound. This will Ground the Dynaco, ONLY through the Pre amp. * Hum gets louder with volume turned louder. --Hum: Usually a sign of bad filter caps. Yes, so it’s something with the amp. It’s likely that the source of the hum and different tubes pick it up differently. Any ideas on how to cure this are very much appreciated. The one is 40 Watts Traco Power TML 40251 C putting out +15VDC at 1333mA and -15VDC at 1333mA and the other one is a 20Watts similar module putting out +15VDC at 667mA and -15VDC at 667mA. Congratulations. Though when I run an app based tv channels (Iptv) on same system, I have lot of humming noise (unbearable). Humming does however not disappear when I disconnect all inputs. So, the preamp and amp together hum if nothing is plugged in or touching the preamp but the amp? So ‘obviously’ the speakers are bad. Remove that piece from the receiver, amplifier, or integrated and the system hum should now be gone. I’ll do it again with a multi meter and check for fixable ground issues. After receiving the amp the push button on/off switch needed to be replaced. Please let me know your thoughts … I’ve been searching for an answer for months and have not been able to figure this out …. But if I use the preamp there is, and also if I disconnect the red and white cables from the back of my turntable, just my fingers touching them will cause the same buzz in the speakers. Could it be a grounding issue or is the amplifier itself? It could be you have CATV cable connection somewhere in the system and the HDMI switching is somehow interacting. I’m not too sure. I have a Logitech Z533 2.1 speaker system which has and is connected to two inputs: 1. Keep turning the dial until you don’t hear the humming sound coming from your amp … But with speaker vol all the way down it’s coming from the speaker. It may be that you have a ground loop problem. pls help, thanx. Only Google tracking. It is when I add a rca over cat5 balun between an amp and a preamp. Again thank you so much. Thanks Paul! May I ask your insight on this problem. Can selector be modified or should it be replaced w/selector w/better internal shielding? Based on this article and literally every studio owner and electrician I’ve been speaking to, they were telling me its a high likelihood its the amp. If you have a 100-watt tube amp, it’s probably going to make more noise than a 15-watt tube amp. When NONE of the inputs is connected, and only 1 headphone amp is connected to 1 of the outputs – I hear that hum when no music playing. Any ideas??? Thanks but neither sample will play. If your theory is correct the hum should go away when you do. 2. If I connect with the tape out loop I can use the volume on the amp and it sounds wonderful and 1/4 volume is rockin' the room, but I know that hum is there very low in the background. I haven’t replaced the cables as yet and they are about 30 years old. I suspect 1 of these is connected the wrong way around. I sent it to Bryston and paid $700 for a refurb and changed the rca inputs to 1/4″ in hopes that using balanced cables would help me avoid the demonic 120hz buzz. I pressed the CD player. Your EL-34s are OK since the Hum is common to both channels. Living in Europe, I have had 2 occasions where I had issues with a 60 Hz hum. Then, connect the CD player and try again. What are your thoughts? This is not a cheap phono stage, it is a Leema Agena costing around 5.000 Euros our side of the Atlantic and it is difficult to convince the manufacturer that there is a problem with it because in other houses there is no hum whatsoever! the hum increases with volume but it doesn’t go away even if I change the source. I used to hear a loud hum sound from the speakers and it disappeared after I plugged all equipment into the power regulator. I pulled each tube starting with V1 and the noise remained until I pulled V6. If it is actually the frequency you suggest it is and inside is a toroidal power transformer, sometimes you can rotate the power transformer to quiet the hum. Check improper wiring from the inputs jacks to the volume . If you have eliminated all cords, effect units, amp settings and continue to hear a hiss, turn your guitar master volume up and down. No change happens with touching anything, and I checked seating of tubes and all seems ok. Pre AMP(s) Ps Audio 4.6 and a Denon Pre amp (I have tried various configurations to no avail, i.e one pre amp, or the other) I have a similiar issue. It sounds like the FM ‘radio’ part of the receiver is shot. I’ve ordered new cables, but afraid it might need service? Remove the cables connecting the receiver, power amplifier, or device powering your speakers. I have traced it to the connection between my Audio Research GS150 preamp unbalanced input to my Marantz sr5013 preamp output. Do I give up on the Feliks amp? My speakers makes popping sounds when I play a CD. thank you, thank you. If the latter then likely you need a new set of power supply capos, if the former, it might be solved with ground loop isolation. I guess it is a 60Hz hum. If I can’t figure out this hum issue and get it resolved I will likely buy an balanced output linestage which will of course resolve this issue. Tried different outputs to rule out bad connection to one of the RCAs. For stations above that frequency the hum is virtually inaudible. That’s pretty strange. I wish I had a better answer but without hands on, it’s hard to diagnose. Therefore, there’s a strange interaction somewhere – but you’ll not find it until you go through the slow and painstaking steps as described. Any suggestions? Hi Paul i broke out my vintage Yamaha RX-995 receiver and Yamaha yp-701 turntable. You can also purchase a cable TV isolation transformers at most stores, or online here. https://www.psaudio.com/ps_how/how-to-find-and-fix-hum/. I have tried several RCA cables to rule out bad RCA cable. If I switch out to a different pre-amp I don’t get this problem so I am pretty sure it isn’t the speaker. I like it a lot, but one thing I've noticed is that on the "high" impedence setting the amp has a very faint hum. I know the ground wire itself isn’t the issue because if I disconnect it, there is a HUGE buzz. I disconnected the pre-amp and the hum was still there. Is there anything you suggest in this situation? Take note so we can come back to this answer. You could try a different type of light. I connected a friend’s Audio Research LS-26 to the VS-115 a couple weeks ago using balanced interconnects and the hum virtually goes away! I have a set of audio engine a 5+ speakers hooked up to a U-turn turntable. It sounds to me like there’s something wrong with your preamp. I then moved the HMDI connection from HDMI 1 to HDMI 2 on my pre/pro and the hum stopped. but the hum wont go away! I am not sure if this violates safety procedures, but I dont think it will, as long as the Dynaco is connected to the Pre.... Yeah, ground a 15A ckt through the shielding of an RCA interconenct, how much current capaity does the shielding carry in the event of a short in the other device. Buy the way I’m in the U.K so running at 220 volts 50 Hz if that’s relevant. Follow the steps in our guide which are basically a process of elimination. Try another piece of equipment in the exact same input on the amplifier. For example, a leaky filter capacitor in the amp's power supply might be causing excessive hum and need replacement. Greetings from a former Bouldarian, from Martian Acres, north of Table Mesa Rd. The HDMI cable is 10m long. With the ARC LS-26 connected using balanced interconnects the hum can only be faintly heard with my ear 8 ” from the loudspeakers. 3. The cable box does not have a case (3rd prong) ground. You can try taking a clip lead or piece of wire, grounding one end on your preamplifier, and poking around on the turntable metal parts or screws when the hum is present to see if it changes. I tried different cat5 lengths cause I thought it was the inwall wiring too long or bad. Is there anything else I should try before calling it and sending it to the hospital? Logically I don’t think a switch could introduce a ground problem even if it is wired incorrectly. There must be a connection from the metal parts of the turntable to the chassis of the preamp/amplifier; from there to ground on a water pipe, a grounded electric outlet box, or a radiator. Stereo Pin: Logitech Bluetooth Adapter – so I can automatically connect to my Macbook Pro without any wires I have been looking at the Pro-Ject Debut Carbon. You’d want to verify that to prove the Deftech electronics aren’t messing with you. Check if the live and Neutral of the Pre Amp mains and the Dynaco mains are correct. I have discovered that whenever the light fixture over our kitchen table is turned ON, it’s causing the speaker buzz. However, since I have been using the filter I have had some issues with my internet getting slow and the cable going out. It’s rare to see a company doing what I can best describe as a public service – congratulations! Many thanks in advance. Thank you. I suppose it’s possible though I struggle to understand the mechanisms at play. as well). Otherwise, could the cable antenna on the roof above me be the issue? Thank you for the diagnostic steps listed above: step #1 – no change in volume; step #2 – hums with all inputs; step #3 – only the speaker wires and AC power supply are connected to the receiver. When a song begins the low level hum can no longer be heard. Looks like I’ll just have to stick with my 1 FM station, as I just installed the 12 8′ LED light fixtures. If you have an immediate question email us sales@psaudio.com and we'll get right back to you. LED lighting requires the use of AC/DC converters typically built into the lights themselves. Hi Paul, Sounds to me like there’s a problem in the amplifier. That expert isn’t giving you good advice. I purchased a Marantz AV8805 about a month ago and I recently started hearing a buzz coming from the right surround speaker, but not always. Wow what a difference. In one class there are two large PA speakers (PreSonus) and in the other four (4) Studio Monitors. Good question and I am not sure of the answer. This doesn't have to be the case, but just as passive line stages can take the boogie out of the sound, so could be the case here. ADS speakers I have tried listening to 60 and 120 samples but they all sound different. If the amp/receiver is the problem, then will a ground loop isolator not work as a fix? I have checked all grounds and even replaced the HDMI cable. Some of the less expensive types are really ugly on the power line, so that could be part of the problem, but more likely it’s airborne and not on the powerline at all. Is it only audible with one input selected, or all of them? I even covered the ground contact of the schuko plug with electric tape as s cheat plug, no luck. Has been driving me a bit mad pinning down the problem! Humming only happens when headphone is connected with or without the RCA cable. an outlet which was only serving this active speaker), and the hum was still there – please note that there was no XLR cable involved in this set-up. If you need a more extensive procedure, click here for the extended version. What should I put there, if anything. My old Sony STR-DE685 receiver suddenly has developed a loud hum coming out of the speakers only on FM (it might be on AM also, but it never pulls in any AM stations so I can’t tell). Is the only solution to get the amp looked at or might a ground loop isolator between the amp and the speakers work? Thank you for such an awesome article. Thanks for your suggestions. Your post sounds very close to my issue. I was blaming the receiver, until I just got a new Parasound Halo A23/P6 combo and I have the same issue. Otherwise, might be time to retire the old girl. This does happen and it’s one of the reasons we ask people to do as you have, disconnect the inputs to the amplifier so only the speakers are connected. But this 60 hz hum also occurs when the LS-7 is disconnected from the VS-115. The only coax I could connect it to was the cable in on the cable box. I have tried plugging everything into the power strip, plugging the strip and the amp into the same outlet, plugging them into different outlets, turning off the Naim, nothing stops the hum. Thank you. Does the hum in your speakers go up and down with volume? You can test for this by using an AC “cheater plug” that lifts the third wire ground from the AC receptacle. I as well tried to unplug all the audio cables and just leave each power cable in individually and nothing has changed. What a relief it must be to have that damned hum gone! The hum is 60 hz. * No inputs connected – still hums the same. Also, if your amp is designed for high gain settings, it will most definitely make more noise than an amp designed to run cleaner. Many CD players that offer a variable ouput can squash dynamics when employed. I get one FM station loud and clear, but that’s it, as the hum is across the rest of the FM frequencies, except the channel I’m getting at 105.7 I’m sure it’s something to do with the LED shop lights, and probably a ground loop, but can’t figure out how to resolve it. Mullard E188C tubes = hum This is my favorite and most useful amp mod, a three-way SPDT ON/OFF/ON mini-switch gives you: Normal feedback / No Feedback / Heavy feedback.The 'No Feedback' position makes the amp break up early kind of like a 5E3 Deluxe.The Marshall JTM45 was a direct copy of the 5F6A Bassman … A surge protector isn’t going to offer you any benefits for hum reduction. If not, keep going and add a source. Sounds like the amp has a problem a ground loop isolator won’t fix. What are your thoughts? Any help would be appreciated. Thanks in advance! Hi Jeff, Its in both channels. It is dead silent no hum or distortion what so ever. Recently hooked it up to my 1974 Marantz 2325 receiver and that’s when I noticed the hum. If you have any suggestions, I, and many others out there, would be grateful for your help! I’m at my wits end. Start with the amp connected to the speakers but with no input cables connected to the preamp. Thx! The Black Ice Fusion F11 Vacuum Tube Integrated Amplifier (henceforth, the F11) is an extremely well-made integrated amplifier with 18.5 watts per channel. The Mullard tubes may be more susceptible to transformer ‘noise’. The preamp is plugged in to a Monster power strip with ground, with a “regular” power cord. the shielding of an audio interconenct is not for carrying fault current. If I turn the amp up, the hum does not increase with the volume of the amp, so I am assuming its not a tube problem. connection that’s bad (shure type V15-III), a bad ground or bad cable from the tt? Seems surprising given how popular they are, but 2 in a row is pretty suspicious. Alternatively I can describe it as white noise (hiss) that happens 3 to 5 times a second. I sent an email yesterday regarding a 60 Hz hum sound coming from my new speakers. There is some hum on 50 and 100 Hz (I am located in Europe) I simply cannot get rid of. If they are quiet, then email me paul@psaudio.com and I’ll try and help you through the problem. Yes. But the modified LS-7 sounds amazing and likely sounds as good or perhaps even better than most of ARC’s reference line stages ever produced. I tried 2 other headphone amps to rule out issue with the headphone amp itself. I have tried removing each piece of hardware from the pre Amp (i.e. All connecting equipment to the AVR is connected from the same power supply which goes through a voltage regulator. The speakers cannot buzz without an amp and if there’s nothing but the amp connected to the speakers then there can only be one answer. Thanks all!! I would hate to have to pack my preamp up and send it for repair, only to find out that there was something else outside of the preamp that I should have done, like an isolation transformer or the humX. I have tried to isolate the wires, etc in my system but have failed to solve the issue so far. To confirm a noisy power tube, merely put the amplifier on STANDBY, remove it from its socket and turn it back on. I have moved the tt to a different location and plugged the power into different outlets. If the Hum is present on the stand alone Dynaco, then its in the input tube(s) of the Dynaco, particularly if the Hum level increases if you turn up the Dynaco's volume level. As the volume increases, a higher pitched hum compared to the 50hz hum increases. I’m having a problem at my music studio. But indiscriminate re-capping of an old guitar amp may not be a sound idea. That sure sounds like a ground loop then. thanks. After I read your article, I physically removed the speaker from the current set-up, plugged just the power cord into a dedicated outlet (i.e. The resolution of the system is not negatively affected at all when in play mode. I have searched but not exhaustively. After not using it for a few days, I turned it on and a huge hum was coming from the speakers. Next, if you remove the inputs to the speakers so that they only have their power cords plugged into the wall, what do you hear? I just realized I never followed-up on this. if I turn off motor, there is no hum. I had the same results. My modified Rotel RCD-991 ( has a totally discrete analog output stage) and the LS-7 are connected to the P-300 with multiwave. It developed a hum on all inputs. I unplugged the CD player but allowed it to be connected to the amp/receiver via monster cables and the hum continued and was enhanced when I touched the CD player. And most odd — back in the iTunes/Apple store movie, if I zoom in (by simply double-tapping on touchpad) so that the screen is filled with the image (as opposed to widescreen bars), the buzz goes away almost completely. All your wires from the RCA jack to the switch and to the first tube's grid must be short ( 1/2 inches ) or shielded. It sounds to me like either a poorly designed turntable or it has a problem internally. I tried different wall plug but no avail. It’s now much quieter than before I bonded everything together. The hum can best be described like a faint diesel engine: doo boo, doo boo, doo boo, etc with white noise instead of a doo or a boo. My amplifier/receiver is 28 years old. I look forward to your suggestions, as I have tried everything I can think of. The preamp is a nuvo grand concerto to a nuvo 2 channel amp.
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