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ground

  1. T

    How to measure continuity for correct ground on MC50?

    I'm trying to measure the continuity across my MC50 with a DMM and I'm having issues. I have the amp unplugged from power and disconnected from any inputs and interconnects. With my DMM in continuity mode, I'm touching the black probe to the chassis and the red probe to both prongs on the power...
  2. 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...
  3. Mat86

    A-1 buzzing when I touch the volume knob?

    Title verbatim, when I touch the volume knob on this I get a buzzing noise through my speakers. I noticed this when I first got the unit and now that I've done some work on it and fired it up again, was reminded the issue's still there. (The A-1 in particular has a weird pot where the balance...
    • Mat86
    • Thread
    • a-1 ground knob troubleshooting
    • Replies: 7
    • Forum: Yamaha
  4. M

    Rotel RCC-945 Ground Issue

    Hello I'm currently troubleshooting a Rotel RCC-945 cd player. It has what seems to be a ground hum. The noise starts at power up when the relay switch clicks (this relay is located by the output terminals). I re-soldered some solder joints that looked suspicious to the eye. These include the...
  5. Johnny_Law

    Solving a Yamaha RX-V430 Ground Buzz / Hum

    My brother's old AV receiver sounded great ... but had a buzzing hum coming from the speakers which became noticeable at really low volumes. The buzz remained the same volume and pitch regardless of input, volume, input mode, etc. It was present via headphones as well...
    • Johnny_Law
    • Thread
    • buzz ground hum rx-v430
    • Replies: 5
    • Forum: Yamaha
  6. P

    Marantz PM550 DC - Restoration advice desperately needed on "where to next"?

    Hi team So I posted a few months back when I found this great looking Marantz amp online https://audiokarma.org/forums/index.php?threads/marantz-pm-550dc-sound-output-distortion.985180/ From that thread I had posted... "The main issue is the sound output. At a low volume there is a distortion...
  7. G

    Simple (hopefully) question about chinese p.supply grounding

    Hello everyone! I have this one simple (I guess) question about grounding DIY amps. I have an old Sony amp/receiver that doesn't work. I have also ordered chinese DC power supply and TPA3255 based amp board. So I thought that I could reuse the chassis from the Sony. I want to use IEC connector...
    • GytisB
    • Thread
    • ground ground connection
    • Replies: 0
    • Forum: DIY
  8. M

    Thorens TD160

    I recently bought a TD160 mk1 with a view to renovating and restoring it. It has a hum. The previous owner at some stage added RCA jacks to the back. The wiring is obviously a mess and I would like to go back to something similar to how the turntable left the factory. However, I would like to...
  9. K-Shaps

    Need help with a grounding issue

    Been awhile since I’ve posted here but I’m trying to solve for a grounding issue in my setup. I have electrical hum/feedback at higher volumes whether I’m using my turntable or an aux cable to an iphone/CD/etc. My turntable (Denon DP-300F) does not have an external ground post and the grounds...
  10. 7Hz Research

    Akai 4000DS II Mains Hum

    Hi everyone, I'm getting mains hum from the line out on my Akai 4000DS II when it's not even powered on. I run it through a Behringer PX2000 patch bay, and the hum goes away if I break the normalised connection by plugging something else through those sockets. The hum gets louder when I turn the...
    • 7Hz Research
    • Thread
    • akai akai 4000ds ground hum mains mains hum tape
    • Replies: 2
    • Forum: Tape
  11. D

    Help, I do not want to make an Ayre, What the heck?

    Hi Everyone, Please help me understand my new balanced integrated Ayre-AX7e integrated amp. I'm scared to hook it up wrong and I can't wait any longer, I need to hear this thing. So before I connect anything, can someone please tell me what the heck this part of the owners manual is saying...
  12. T

    Technics SL-1300 buzz touching ground stops buzz

    I have an SL-1300 that I got off mercari. Generally working very well. RCA's and Ground look original possibly. I hooked up to Pre-amp and I am getting general buzz. Ground is just loose wires no fork with plastic, maybe fork was cut off. When I touch copper directly while on the ground on...
  13. DoctorJon

    Vintage Record Player Humming/Buzzing!

    Hello, I recently acquired what I presume to be a Sylvania Record Player from the 1950s. It plays records excellent without problems, however.... it has this buzzing coming from the speakers that can't be ignored when on medium/high volumes. It only starts when the record turntable is engaged...
    • DoctorJon
    • Thread
    • 1950s buzz fix ground hum noise phonograph record player repair vintage
    • Replies: 50
    • Forum: Turntables
  14. M

    Grounding TT with no ground post to new phono preamp

    I was recently gifted a Crosley c200 TT which has a built-in phono preamp. I recently decided to upgrade the built-in preamp by switching to a Hagerman Bugle 3. The new phono stage has a grounding post but the TT does not. I am noticing a small hum when I have the TT connected to the phono...
    • Michael Wall
    • Thread
    • ground grounding grounding buzzing sound humming humming sound phono pre amp phono preamp phono stage turn table turntable
    • Replies: 18
    • Forum: General Audio Discussion
  15. lenos

    HF-81 (and general) grounding question

    I recently completed a ground up rebuild of an HF-81 using all new components except transformers, switches etc. It took a bit of debugging to get it all going but then I had a few moments where I could hear what this thing might be capable of before other issues popped up. One of the things...
    • lenos
    • Thread
    • ground hf-81 hf81 hum
    • Replies: 14
    • Forum: Eico Place
  16. M

    Grounding TT with no ground post to new phono preamp

    I was recently gifted a Crosley c200 TT which has a built-in phono preamp. I recently decided to upgrade the built-in preamp by switching to a Hagerman Bugle 3. The new phono stage has a grounding post but the TT does not. I am noticing a small hum when I have the TT connected to the phono...
    • Michael Wall
    • Thread
    • ground grounding grounding buzzing sound humming humming sound phono pre amp phono preamp phono stage turn table turntable
    • Replies: 0
    • Forum: Turntables
  17. davstev

    Kenwood 700M : common ground?

    Hi folks, I have a Kenwood 700M amplifier and I am not sure if it has a "common ground" or not. I am asking because I also have a Koss ESP-9 electrostatic headphone set that requires tapping into the speaker outputs on the 700M to drive them. I have read (and yet don't fully understand) that...
    • davstev
    • Thread
    • 700m common ground ground grounding kenwood
    • Replies: 0
    • Forum: Solid State
  18. S

    Preamp with two phono inputs and one ground

    I have a preamp that has two phono inputs but only one ground pole. Can I connect both turntables’ grounds to that pole at once?
  19. Y

    Technics F-G-Servo Player SL-23 Humming Issue

    Hello, I bought a Technics SL-23 turntable, and it played fine when the guy connected it at the store. I took it home and then found out that the needle was damaged, probably my fault, so I bought a new one and replaced the broken one. I have power speakers, which worked fine with my previous...
    • Yafim
    • Thread
    • buzzing ground ground connection ground issue hum humming technics
    • Replies: 1
    • Forum: Turntables
  20. G

    Very noisy Dual HS39

    Hi guys, I was wondering if you guys could help me out: Recently I picked up a small lot of Dual turntables that needed fixing up. Two of those came with the HS39 plinth with built in amplifier. One of them is busted up pretty bad but the other one looks mint and worked after some small fixes...
  21. W

    Pioneer SX-1000TW/Technics SL-D2 problem

    Hey - I recently purchased a Pioneer SX-1000TW and a Technics SL-D2 and there is a humming/buzzing noise when the right channel is selected along with minimal output, left is fine, and in stereo--as you might imagine--the hum is present, but lessened. I get the same noise when I connect my...
  22. cmcguire

    Motor hum? Electromagnetic Interference ? Ground issue?

    I'm at a total loss. I have two identical turntables (Mission 775s) with Shure cartridges. They use slightly different grounding schemes and BOTH have the same issue: when the cart reaches the centre of the record there is a low, but audible hum. These tables sound fantastic and solving this...
    • cmcguire
    • Thread
    • ground hum noise mission turnables
    • Replies: 25
    • Forum: Turntables
  23. KNielsen

    Acurus A250 and starground

    Hey Ak I'm restoring my Acurus A250 and at the same time making some mods, this includes new starground curciut. I'm splitting input and feedbackground (now they share same ground at input), but what about D3/D6...??? I parallel a 4,7uf/470nf cap over these for lower noise, but should I also...
    • KNielsen
    • Thread
    • a250 acurus acurus mod diode feedback ground input mod rebuild starground
    • Replies: 908
    • Forum: DIY
  24. Kevbo

    Loud, Low Hum When Marantz Turned On

    I have been using my Marantz 2240B for about two years now with little issue (all have been fixed). And today, which was just another morning for me to turn it on to listen to music while working, a loud, low-grade hum is coming from the speakers. Music still plays fine, but there is the hum on...
    • Kevbo
    • Thread
    • audio audio issue ground hum hum noise humming humming sound marantz speakers
    • Replies: 36
    • Forum: Marantz Audio
  25. M

    2220B adding actual Ground to Power cable

    Hi! New here and thanks for all the info here on my 2220b. I have had this about 10yrs and over the holidays I noticed things didn't sound right and sure enough all my internal voltages were off a little from spec. So got out the meter and spent some time on the bench getting everything back to...
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