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harman kardon 630

  1. C

    HK 630 twin burnt resistor on Tuner/Preamp Power supply and other issues

    Hello! I recently inherited a old Harman Kardon 630 that hadn't been powered up in 30 + years. Before I powered it on I noticed that I had a burnt resistor on the tuner/preamp power supply. I decided to still power it up with a dim bulb and everything seemed to be working and the bulb stayed...
  2. C

    Questions about servicing and powering up a Harman Kardon 630 for the first time in 30 years

    Hello, I recently inherited a old Harman Kardon 630 from my grandfather. They bought it new and was always super careful with there stuff and were really happy with it but "upgraded" to a black plastic pioneer in the late 80s and since then the Harman has been siting in it's box in a closet for...
  3. OskarBas1

    Harman Kardon 630 Humm/Buzz

    My 640 is making a kinda anoying Humm/Buzz sound. When i experienced the same thing with my 330B i replaced the 2SC458 transistors with great results. So I'm wondering if there is any similar transistor in the 630 known for making these kind of noices and In that case what should I replace it...
    • OskarBas1
    • Thread
    • harman kardon harman kardon 330b harman kardon 630
    • Replies: 1
    • Forum: Solid State
  4. dlucy

    dlucy's guide to Harman Kardon Twin Powered series 430, 630, 730 and 930 ... and Montgomery Ward 450

    The fourth era of Harman Kardon's solid state stereo receivers were the Twin Powered series: This thread is a guide to those models, their specs, and pointers to schematics and restoration threads for each. Note: If you have additional information on any of these models or have a great...
    • dlucy
    • Thread
    • 430 630 730 930 harman kardon harman kardon 430 harman kardon 630 harman kardon 730 harman kardon 930 hk
    • Replies: 24
    • Forum: Solid State
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