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hum

  1. Basspig

    McIntosh MC225 60Hz Buzz, Vol at Min, No Inputs

    Got a mystery problem here. MC225 amp, all new tubes, s/n A-weighted, left channel 80dB, right channel 72dB. Audible 60hz buzz with nothing connected to the inputs and volumes at minimum. Tried the filament circuit modification (ungrounding one side and putting 220Ω balanced resistors across...
  2. Ray66

    Sony STR-7065A Transformer Hum

    My current restoration project is a Sony STR-7065A. Aside from the usual problems (dirty contacts/pots, burnt out lamps, etc.), it has a very noticeable hum coming from the transformer. It's moderate when idling, but pushing it to max power into dummy loads gets it buzzing really loud. To be...
    • Ray66
    • Thread
    • hum sony transformer
    • Replies: 6
    • Forum: DIY
  3. D

    Sansui G9000 hums as soon as speakers are switched on

    I recently spent alot of time & love on my G9000 (Full thread here: https://audiokarma.org/forums/index.php?threads/sansui-g-9000-yet-another-protector-wont-come-off-thread.1095294/) It's got two new F2806 boards , new power caps (with these boards: Moderator note: link to eBay removed as that...
  4. Leestereo

    Leestereo Mods, Tweaks and Tips for the Sansui 771

    Part 1: Random "Popping" Noise This 771 exhibited random "popping" noise in both channels; measurement of the DC offset at the speaker outputs, demonstrated that the reading would fluctuate widely, reaching at times, several hundred mVs. This behavior was independent of input source and was...
    • Leestereo
    • Thread
    • hiss hum modifications noise restoration sansui 771 tweaks upgrade
    • Replies: 93
    • Forum: Exclusively Sansui
  5. F

    three possibly unrelated issues / 2325

    Hey guys. I have a 2325 that I re-capped a few years ago. Sounds fantastic hooked up to my AR-11's............. I have three issues, some of which I hope you lot might be able to comment on: 1) It's recently starting to hum across both channels. I pulled the lid and checked the PS: spot on...
  6. DG_lite

    Where to start on my Lafayette LR-221

    Hi all, as the title says, I have a couple small but annoying problems with this rare quadraphonic receiver. I think I know what the issues are but this is my first time trying to track down and rectify such problems. I'd like some guidance on where to look for my problems and what to replace...
    • DG_lite
    • Thread
    • buzzing hum hum issue lafayette lafayette recievers repair repair advice repair advice help needed
    • Replies: 27
    • Forum: General Audio Discussion
  7. B

    Curious hum in my Zenith 5k29 Amplifier (MK2608)

    Hi there! Following up on my past thread here: https://audiokarma.org/forums/index.php?threads/adding-switch-and-line-input-to-zenith-mk2068-console.975293/ My grandparent’s Zenith console is doing well! I ended up going with the switch between the Preamp output and 3.5mm connection for an...
    • bbs71364
    • Thread
    • amp buzz console console amp hum zenith
    • Replies: 1
    • Forum: DIY
  8. H

    Yamaha YP-700 grounding fix (applicable to many other brands too (separate signal ground from chassis/tonearm ground)

    I got my Yamaha YP-700 quite recently and have undertaken a number of maintenance activities. There was a slight noise coming from the turntable. First I thought that maybe the noise was picked up by a fairly long and cheapo RCA-cable from my phono preamp to the speakers but this was not the...
    • Hko
    • Thread
    • grounding hum yamaha yp-700
    • Replies: 2
    • Forum: Turntables
  9. J

    MX113 Low Left Channel

    Hi all. Just finished replacing all of the important capacitors on my MX113. I did not change any transistors, I do not have experience diagnosing transistor issues. Working great with two caveats: - A low hiss on both channels. Happens on both Aux and Tape inputs, and both Main and Tape...
    • Jacope
    • Thread
    • dull hiss hum input left channel mcintosh mx113 output right channel
    • Replies: 2
    • Forum: McIntosh Audio
  10. B

    Preamp has 1 Center out RCA connector, Amp has 2 for Center input; Connect and Get Hum. Do I need a RCA terminator plug?

    I've just hooked up a NHT M6 speaker as a center speaker (not having one before) connected to an Onkyo Integra DHC-60.5 preamp and DTR-9.9 receiver (140 wpc x 7) as amp. Now I have an annoying hum coming from the added center speaker; involving the receiver/amp, with no hum when preamp is off...
  11. M

    Kenwood KR-4070 receiver: output problem

    Hi all, so far I have learned a lot on this forum. I hope one of you can help me with a weird problem with a Kenwood KR-4070 receiver. I recently bought it, without knowing if it would work or not. Luckily most of the time it does and when it works it sounds really good (both on tuner and on...
  12. C

    Elekit TU-8550 humming

    I'm seeking some guidance in troubleshooting a problem with my first ever tube pre-amp build. I'm relatively new to electronics, and hence this post. I'm competent with the usually hobbyist projects, and after researching and reading a few key posts on this site about the Elekit TU-8550, I took...
  13. B

    Chinese Ear834 preamp trouble

    Hi all, Brandnew to this forum. Ive been a phono listener for years and enthusiastic guitar pedal builder. So I thought let's try and build a tube preamp for my TT. And that's where trouble starts. I've build a Chinese Ear834 clone, but I'm getting 50hz hum when playing. The preamp does...
    • Bulletseever
    • Thread
    • diy ground loop help hum preamp
    • Replies: 16
    • Forum: DIY
  14. J

    Pioneer sx-680 sets off dim bulb tester

    Hi guys. I’ve got a school-680 with a problem. I get a hum from the right channel and the dim bulb lights bright. Major static. I thought it was the STK, but if I install either one in left channel, everything is okay. And either one in the right channel is bad. I’m stuck. Any ideas? I can...
  15. 'goodtimes'

    Marantz 2385 no output on left channel of both Phono 1 and Phono 2

    Hello out there in Marantz land! I have been working on this beast of a receiver and it has been going pretty well thus far. The original problem was the main filter caps, one deteriorated internally but luckily it didn't take anything out with it. I did my own version of the restuffing them...
  16. R

    Help. Thorens TD 125 mkII Acoustic feedback.

    I have a Thorens TD 125 mkII with SME 3009 imp. Fitted with Shure m97. When playing at normal levels no problems. But when I crank up the volume, there is a acoustic feed back. I have tested the following: - I shut down the player so it stops spinning. When I place the needle on the record...
  17. C

    Recapped and restored sx-750 50hz hum and white noise problem

    Hello, after a 3 day fight I gave up. My sx-750 started to generate a very quiet but audible hum mixed with some white noise on both L and R speakers. Not volume dependant. Unit is cleaned and fully recapped, worked for some time with no issues at all. I unplugged L and R signal posts on amp...
  18. T

    Looking for help diagnosing buzz/hum/ground loop in my "HIFI" GUITAR rig!

    I have been experiencing a bad, loud, and variable noise in my electric guitar rig. Here is the details of the rig (I will include as many details as possible since ground loops are tricky): > Electric Guitar (active electric guitar with on-board buffer, 9V battery, and On-Board Effects Loop...
  19. D

    Marantz 2220b phono hum

    First post from novice DIY. I replaced the lights and cleaned the connectors on my wife's original 2220b receiver and it sounds much better. During testing, I noticed a significant hum from the phono selector with no external turntable or other inputs attached. It was very noticeable at 1/4...
  20. C

    Pioneer SA-9800 buz/ hum. I just can't fix.

    Hi, This is my first post on AK. I just bought a Pioneer SA-9800 that was supposed to be fully working. I've been looking for one for a while and thought I had a good one ready to fully restore by re-capping and replacing some of the known bad transistors. On inspection it had a very odd...
  21. kasbah512

    Selective Ground Loop Hum... HELP Please.

    This is somewhat me circling back to an issue I was having months ago. I've been working on a Marantz 1200 on and off for a long time. I'm convinced its possessed by the previous owner at this point... The issue: -Ground loop-ish hum on the right channel only (next to the transformer)...
    • kasbah512
    • Thread
    • fully restored ground loop help hum marantz marantz 1200
    • Replies: 1
    • Forum: Solid State
  22. J

    MX110 hum (continued)

    Hi! Need some advice regarding my MX110 (s/n 591Z9), which was fully recapped in 2013 and partially last year with a transformer replacement. Last year, I had the unit serviced by a local McIntosh service center to fix a loud hum, wherein they added a 10 uF/450 capacitor (I assumed at the time...
  23. TomTom4049

    Kenwood KA-3500 hum problem through speakers (not transformer)

    Had a problem with one of the batwings so I replaced them with the recommended OnSemi replacements suggested by SilverFace. Except for distortion in the right channel it was working. I discovered when I pressed down slightly on a new capacitor C14 the distortion went away for a few minutes. I...
  24. C Hart

    Equalizer hum when engaged, silent when disengaged

    Hello solid state gurus. Thanks for checking out this thread and for any help you can provide. I have very little experience in repair or rehab on solid state components, and I hope someone can help me with suggestions for an equalizer that recently started misbehaving. My Alesis M EQ-230 30...
    • C Hart
    • Thread
    • equalizer hum troubleshooting
    • Replies: 8
    • Forum: Solid State
  25. J

    Beomaster 2400 radio hum

    Hi, I am restoring/repairing a Bang&Olufsen Beomaster 2400. After a minute or so, a hum starts from a tuned station, no hum between stations. Hum is propably 50Hz. I have recapped all electrolytes. I suspect something wrong in the stereo decoder section. Could it be the IC itself? Has anyone...
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