• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

yamaha m-4

  1. B

    Yamaha m4 needs some help

    Hey all, first post here. I recently picked up a Yamaha M4 amp on Facebook. When we tested it it sounded good (BA A200 speakers) but had dirty pots. I have since cleaned the pots with deoxit and they turn smoothly. When I plugged everything in the right channel (speaker A) would go in and out...
    • Bootcoot
    • Thread
    • repair advice yamaha m-4
    • Replies: 22
    • Forum: Yamaha
  2. 44100_Hz

    Yamaha M-4 Speaker B Output Issues

    Hello! Long time lurker, first time poster. I recently purchased a Yamaha M-4 which I've been running through the speaker B output as the speaker A button was stuck (but not engaged). I've been experiencing output issues where the audio will get extremely quiet in one or both channels or become...
    • 44100_Hz
    • Thread
    • speaker selector yamaha yamaha m-4
    • Replies: 16
    • Forum: Yamaha
  3. Cergei

    Yamaha M-4 | Bias Calibration do not last

    Hello ! I noticed that my M4 Bias current needs to be re-calibrated somehow “often”. All electrolytic capacitors were replaced recently. Any idea ? Thanks
    • Cergei
    • Thread
    • bias adjustement yamaha m-4
    • Replies: 11
    • Forum: Yamaha
  4. Cergei

    Yamaha M-4 | Relays not connecting after recapping

    Hello everyone, I completed the replacement of all electrolytics on my unit purchased in 1980, and noticed that once I power up the relays are not connecting. I measured on Left channel the voltage, instead of getting +65, I got 28.5V, while on the Right channel I got 44.4V instead of 65V. I...
    • Cergei
    • Thread
    • protection circuit reccaping relays yamaha m-4
    • Replies: 32
    • Forum: Yamaha
Back
Top Bottom