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hk730

  1. R

    HK730 help

    Good day all. Newbie here and looking for some direction from this knowledgeable community . I have recently taken an old HK730 Twin Receiver out after decades of being in storage. I will try and list where I am at in steps: 1) Opened unit and found 2 slow burn fuses on the main rectifier...
  2. H

    HK730 Blows all four fuses

    Hi I dropped my HK730 while trying to clean it and it landed on the corner where the on/off button is, since then it blows all four fuses as soon as I turn either of the speakers A/B on. The reciver starts up fine and lights up but as soon as i turn either of the speaker outlets on it blows all...
    • hakno
    • Thread
    • harman kardon 730 hk730
    • Replies: 2
    • Forum: Solid State
  3. A Sound Mind

    HK 730 Output Transistors

    I'm restoring this receiver and pulled the output transistors for testing and to apply new sil-pads and compound. It uses 2SB541 and 2SC388.matched pairs. I tested them on an auto tester and they id'd correctly, but their hfe results were far below spec. Does this mean that they're tired and...
  4. Zyork4823

    Frequency sound coming from power amp board HK730

    Riddle me this...working on a Harmon Kardon HK730 and everything seems to functioning correctly but I am hearing an audible tone coming from somewhere on the power amp board. The tone pitch and volume that I'm hearing is dependent on the frequency tone i am feeding into the AUX. So if it's a...
  5. Zyork4823

    Harman Kardon HK730 Low volume right channel

    Troubleshooting and restoring an HK730, the right channel has a much lower volume output compared to the left. It doesn’t sound bad just really have to turn it up. Doesn’t matter if it’s on speaker-1 or speaker-2, or what source input I use. If I plug in headphones it does the same thing...
  6. HUM

    Did I fry my Harman Kardon? Please assist. Ty

    While trying to remove the 8v fuse lamps on my HarmanKardon 730 twin power i touched both sides with the pliers. Should have never been on. Unfortunately the lamps that were on, like the pointer and one behind the dial, went off. After installing the new bulbs behind the dial none of the lamps...
    • HUM
    • Thread
    • diy fuse harman kardon help hk730 lamps short twin power twinpower
    • Replies: 11
    • Forum: DIY
  7. K

    Harman Kardon 730 - Power Amp Noise - Solutions

    I must start this thread with a gracious thank you. I've gleaned so much from this forum that it seems fitting that I give back with a small post of success. Most of these solutions have been suggested by others on this forum and so have made this possible. I will simply post what I have done to...
    • kanurys
    • Thread
    • harman kardon hk hk730 solid state
    • Replies: 3
    • Forum: Solid State
  8. dlucy

    Recapping and repairing a Harman Kardon 730 twin power series stereo receiver

    @sfox52 asked me to recap his hk 730 twin series and since finishing that last week, someone else is asking for the recap BOM, so I'm posting that part quickly here and I'll fill in the details and the input-panel-repair and ps-for-LED-pointer-replacement goodies when I have more time. Index to...
    • dlucy
    • Thread
    • bom harman kardon 730 hk730 recap recapping
    • Replies: 349
    • Forum: Solid State
  9. JPJ

    fell into a crazy tube system but can't keep everything, looking for advice on best way to upgrade

    Kind of a long story and wasn't sure where to post. I'm new to posting on the forum (have used it as a resource plenty) and have always used a low budget setup at home. I've had and really enjoyed an HK 730 paired with kef Carlton iii's. Audio is either coming from my technics 1200 mkII or...
    • JPJ
    • Thread
    • harman kardon hk730 kef mcintosh technics 1200 tubes upgrade
    • Replies: 7
    • Forum: Members' Systems
  10. dyche01

    Modding the Harman Kardon 730 phono stage

    About a year ago I bought a sweet little HK730 receiver from a beloved HK'er in the Bay Area, @sberger. After some routine cleaning and maintenance, which included upgrading the power supply and sub-rectifier capacitors, the unit sounded really sweet. It also looks quite spiffy: The tuner...
    • dyche01
    • Thread
    • harman kardon hk730 phono pre-amp receiver
    • Replies: 44
    • Forum: Solid State
  11. PastTechFan

    Harman/Kardon HK730 Problems -Help!

    Well, my Dad's HK730 crapped out in mid-song last week. I think I've narrowed it to the preamp section (no signal out to another amp), but the amp section (when fed from another pre) only seems to have one channel. (I've forgotten which, but could check if that helps.) I checked all the...
  12. C

    McIntosh XR5 speakers: What do I need to drive them?

    I just found a pair of McIntosh XR5 speakers for $60 and had them refoamed. Curious to hear peoples impressions of these. They seems to have very nice, semi forward midrange and lots of detail with treble that can be a touch shrill but is also very realistic to my ears. What do I need to...
  13. xrayspex77

    HK 730 Separating Heatsink from Amp Board

    My HK730 has a 40VDC (at Speaker Terminal) Spike in the L Channel when powering On. After about 5 mins it will settle to around 100mV. If I power off/on the spike is minimal. Discovered that unplugged I get 8VDC at the L Terminal until whatever Cap it pulling from is drained. R Channel is Good...
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