• 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

pm655

  1. Z

    Harman Kardon PM655 hum in both channel

    Hi Guys, I have a frustrating problem with the PM665 amplifier - a 50 Hz hum at the output that doesn't change with increasing the volume, and is equally audible on both channels. The level is low but audible in silence at a distance of 1-1.5 m. Taking into account the above, it means that the...
    • zlatko13
    • Thread
    • harman kardon hum on the output pm655
    • Replies: 8
    • Forum: Solid State
  2. L

    Harman Kardon pm655vxi repair help

    Hi Guys, I need a bit of help with my PM655 Vxi unit. I bought it completly dead and I'm trying to fix it, but I've hit the brick wall and can't figure it out. The amp fries resistors R474 and R476, as well as Q430. So far, I've replaced (as they were confirmed dead) the following, see the...
    • lemkoo
    • Thread
    • harman harman kardon kardon pm655 pm655vxi pm660
    • Replies: 2
    • Forum: Solid State
  3. A

    Harman Kardon PM655 . Strange value of voltage

    Hi, After the schematics (power supply zone) ; instead to have +35.6v for Q5 2SD669 and -35.6 v for Q6 2SB649 i have 42v and -42v ! For the rectifiers bridges i have 44.8v and -44.8v for both... Also the heatsink of q5 and q6 are very hot... Is there someone who spot it too ? Just for...
Back
Top Bottom