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repair

  1. O

    Music Hall MMF 2 subplatter frozen on spindle

    MMF-2-subplatter-spindle by Otto Mann posted Jul 11, 2020 at 10:22 AMHi all -- newbie here. I have a Music Hall MMF 2 (tag reads MMF 2, not MMF 2.1, 2.2, etc.) The belt was just slipping. Discovered the subplatter would not turn without notable effort. Removed subplatter and spindle (see pic). I...
    • Otto Mann
    • Thread
    • bearing help music hall repair spindle subplatter
    • Replies: 3
    • Forum: DIY
  2. K

    Acurus A150

    My recently purchased Acurus A150 has an issue. It appears that one of the channels is failing to transmit lower frees (sub 200 hz) to the speakers. Lots of troubleshooting has isolated the issue to one channel in the amp (swapping speakers, swapping preamps, swapping cables... etc.). While I...
  3. AlexHempel

    Beomaster 4000 Distortion and Nasty Hissing Noise

    So I'm repairing a Beomaster 4000 for a friend. After some work, I got it to bias correctly and went to play some music. The first time I listened, no major issues. I did notice that, after being turned off, it took a second or two for the music to fade out. I assume this is a function of being...
  4. vinylviola

    Glue for Polk LS70?

    Hi all - I scored a minty pair of Polk LS70's today. I'd never heard any of the LS before (huge SDA fan) but I'm pretty impressed thus far. I agree with what I've read on here about them - pretty directional and boomy bass, but we'll work on that later. For the moment, the issue I've...
    • vinylviola
    • Thread
    • glue polk audio repair spider woofer
    • Replies: 0
    • Forum: Speakers
  5. canuckken

    Peachtree iNova Died

    The title indicates the problem but I don't know where to go with it. I purchased the iNova and a Peachtree 220 power amp from the same seller a few months back. I was using the iNova as a pre with the 220 and it worked and sounded fine with one exception, I would receive an occasional...
  6. rocketrobo

    JDS Labs Element - DAC - how to open?

    I have a JDS Labs Element 1.53 DAC / headphone amp, it makes a bit of a scratchy noise sometimes. Taking the base off, it looks like there is some capacitor leakage under the board. I'm able to troubleshoot this, and to replace anything that needs it. Does anyone know how to open the unit to...
    • rocketrobo
    • Thread
    • jds labs element repair
    • Replies: 1
    • Forum: DACs
  7. R

    Volume drop on one side of headphones

    Hello, Is there a most-likely cause for headphones losing significant volume on one side? Suddenly I'm only getting about 30-40% volume on the left side. My diagnostic capabilities are limited to taking a multimeter to the plug, and I'm getting the same resistance reading from both channels...
  8. creator12

    Just got my first McIntosh! A MAC 4200 Receiver.

    Hello! Over the course of the last couple of years I have been split between two systems that were both primarily made up of Yamaha components. My first system at home contained a Yamaha R-100 receiver, K-2000 cassette deck, Genesis 1+ speakers, ADC Sound Shaper One Ten MK.II, and a Dual...
    • creator12
    • Thread
    • battery mcintosh memory new purchase reciever repair replacement setup tuner
    • Replies: 8
    • Forum: McIntosh Audio
  9. C

    KLH Model 6 silent tweeter

    Hello, First off I apologize if I'm putting this in the wrong area or messing up formatting, this is my first post haha. So I recently picked up a pair of KLH Model 6 speakers for $10. Physically they're good, no sign of abuse or anything. One sounds awesome, however the other's tweeter is...
    • cojobe
    • Thread
    • diy help klh model six repair
    • Replies: 10
    • Forum: DIY
  10. chowder857

    Information on how to diagnose problems in an amplifier

    Hello all - I have a JVC AS-3 integrated amplifier from around 1979. I had not used it in many years, so I hooked it up and found that it has weak output and almost no channel separation. Part of me is thinking it might be a fun project to try and diagnose what's wrong, given that I can solder...
  11. K

    Sony STR-7065--PCB char-is it a make or break issue?

    All, New here and newbie to repair. Stick with description please! I picked up an 7065. Did some cleaning and inspection. Several caps seem new? Speaker B and C channels right, sometimes left were not working. Speaker A seemed to be OK. I noticed up near speaker inputs on supply board there...
  12. V

    SX-636 no longer working properly after using DBT

    To preface this, I am new to audio repair and definitely did not think I was going to be getting into a full repair with this receiver. I'm handy with a soldering iron and have a multimeter, but I don't have a huge amount of experience or knowledge with electronics. I'm excited to learn, but...
  13. goldswimmerb

    Marantz PM300 bias won't adjust down

    Hey guys, I'm working on a Marantz PM300 (not the greatest work by Marantz but honestly not too bad either) The dim bulb lights up bright, however both channels do produce output, testing I noticed that my bias for one channel was at 310mv at the lowest adjust point on the trimmer, and can only...
  14. A

    Marantz 1030 repair - left channel noise

    Hi all, I´m new here. My Marantz 1030 has a loud hum/noise in the left channel, right is ok. The noise is there with volume at 0, I´ve made a little video to demonstrate: I´ve built a couple of effects pedals, so I know a little about reading schematics and I can solder, but this is completely...
    • artrr
    • Thread
    • 1030 hum left channel marantz repair
    • Replies: 8
    • Forum: DIY
  15. Taavip

    Kenwood KA-5500 left channel repair

    Hello from Estonia! Hope you are all well. Got my hands on this really sweet '77 year Kenwood amp. Unfortunately left channel is dead. I really like this amp, so I would like to repair and restore it. Hopefully you can give some little guidance needed to bring this amp back to life. Before I...
  16. R

    Repair Denon PMA-280

    I am trying to repair my Denon PMA-280. The fuse blew, and it keeps blowing after replacement. I measured the transistors attached to the heatsink (C3853 and A1489), and one of them shorted on all combinations of the legs. This is the C3853 at place TR319 (schematic), for speaker channel B. I...
    • Rinkert
    • Thread
    • amplifer denon repair transistor
    • Replies: 4
    • Forum: DIY
  17. goldswimmerb

    Sx-990 rebuild + Questions

    Hey guys, so I am currently working on restoring a "barn find" SX-990 and had a few questions. I've gone and rebuilt the amplifier stage as it originally had a blown output, but noticed a few things and wanted to see if anyone with experience could weigh in. I replaced the driver Transistors...
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