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ka-3500

  1. J

    Kenwood KA-3500 blown resistor after recap

    Hi all, I've been using my dad's old KA-3500 for some time now and it started to have some channel imbalance a few months ago. Just finished a full recap today. However, when I powered it on I saw a glow in the reflection of the heatsink plus a bit of smoke. I immediately turned it off and tried...
  2. tusntuk2

    HELP! Can't set BIAS on Kenwood KA-3500

    Greetings fellow Ak'ers! This puzzle has me stumped - any good puzzle solvers out there wanna try it? I have rebuilt a Kenwood KA-3500 amp with a full recap, many transistors, resistors and diodes, and new Bournes trimmers, too. This is my 12th recap of this model, but I'm stumped. The Left...
  3. Super Noob

    Project: Kenwood KA-3500 (Nate Dogg)

    Well - here goes another rebuild thread. In the last month or so, I succumbed to pressure applied from that other person living in my house. I listed a few of my pieces for sale locally on my wifey's face space marketplace. Needless to say, we didn't get much interest in the pieces listed...
  4. JRH99

    KA-3500 right channel cuts out - turning volume above 7 brings back

    I have a KA-3500 which I recapped and has been working for the past year. Sent it off to collage with my son and after about 6 months of use it now will cut out on one channel. I found that if you turn the volume up to about 7 the channel will come back. Will play for a few hours then cut out...
  5. Hoytis

    Where to find a wood case?

    Hey, all. I have a Kenwood KA-3500 amplifier and would love to put it in a wood case. However, I'm not seeing anything out there on eBay or elsewhere. Anyone have any ideas? Any builders out there? Or is there a place that offers used vintage cases that I don't know about. Any help would be...
  6. N

    Trio Ka-6004 found at the dump today

    Found a Ka-6004 at The dump today exterior great inside you tell me , No sound from speakers crackle if I jiggle a knob , could all this dust be the issue? First 2 are the front end not toooooo bad but look a rear :(
    • Nik6667
    • Thread
    • ka 8006 ka-2000 ka-3055 ka-3500 ka-4002
    • Replies: 18
    • Forum: Solid State
  7. rickl

    KA-3500 cleanup

    I hate to call this thread a resto after reading hopjohn's excellent 3500 restore https://audiokarma.org/forums/index.php?threads/the-ka-3500-restoration.840144/ This will be more of a clean up. Here is my latest find. Went to pick up a KR-5030 but it was sold after my 1 hour drive. Checked...
  8. tusntuk2

    How do you tell what is most important when substituting transistors?

    A constant topic - transistor substitution. I needed a sub for a 2sc1222, and as the dates on the threads change, so do the answers. Some is due to obsolescence, of course, but it is changes due to the understanding of how the transistor is applied in the circuit that seem the most important -...
    • tusntuk2
    • Thread
    • 2sc1222 compare transistors equivalent ka-3500 muting circuit transistor replacement transistor substitute transistors specifications
    • Replies: 6
    • Forum: Solid State
  9. tusntuk2

    Have you seen a KA-3500 with no power supply regulator?

    Looking at my second KA-3500 with no apparent regulation of the power supply. Missing parts - diodes, resistors and Qe25, and only two jumpers in place of the diodes. Is this legit? Wouldn't it affect many more parts that were designed for a regulated supply? Would it create more noise...
  10. D

    Troubleshooting crackly channel

    Hi. I need some help diagnosing a problem. I have a Kenwood KA-3500, which has developed a problem with one of the channels crackling. The crackle doesn't start immediately when the amp is turned on, and takes at least a minute to get going. The channel still plays, but does seem to be down on...
    • DoktaDave
    • Thread
    • crackle ka-3500 kenwood troubleshooting
    • Replies: 3
    • Forum: Solid State
  11. tusntuk2

    Please help to find treble pot for Kenwood KA-3500

    Hello again - need some help to find a 50K (dual) treble pot for a Kenwood KA-3500. It's a PCB mounted "spider" design, also seen in a few Peavey amps. Anybody know where I should look/ask for one? Thanks!!
    • tusntuk2
    • Thread
    • 50k dual pot ka-3500 kenwood spider pot treble pot
    • Replies: 5
    • Forum: Solid State
  12. tusntuk2

    Kenwood KA-3500 bias needs help

    Hello again, just love this forum and the gracious help here! I just finished completely recapping a Kenny KA-3500, and the DC offset shows -6mv on one side and 56mv on the other. Not terrible, even if a little unbalanced, I understand, but when I check the bias it seems to wander from about...
    • tusntuk2
    • Thread
    • bias bias trimpot replacement ka-3500 kenwood
    • Replies: 3
    • Forum: Solid State
  13. redpackman

    Substitute semiconductors for Kenwood KA-3500

    I am working on a Kenwood KA-3500. I have found three transistors that are blown. The service manual says they are the 2SA733Q or R, the 2SA620WB 4 or 5 and the 2SA850C or D. Of course all of these are now obsolete. Any suggestions as to fitting substitutions? I've tried Digikey and totally...
    • redpackman
    • Thread
    • ka-3500 kenwood
    • Replies: 2
    • Forum: DIY
  14. Almonds

    It all started with a $30 pair of Rogers LS7

    Hello All! I was at the swap meet in San Diego last week and I saw a pair of real wood speakers that were gorgeous. I've lived in an apartment for 16 years but we bought a house last month and I've always said I was going to put together a Hi Fi system when I had the space. Just the looks of...
    • Almonds
    • Thread
    • ka-3500 ka-9100 kenwood vintage speakers
    • Replies: 16
    • Forum: Introductions
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