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amp board

  1. benjaminlee

    KR-6600: No sound in one channel after amp board repair

    I had some issues with transistor noise on one channel, which I fixed, but some similar issues appeared on the other channel. I decided to go ahead and replace everything on the amp board with a repair kit off of eBay; essentially everything but the resistors, in hopes of future proofing a bit...
  2. L

    Help with sta2100d amp

    I i’ve been working on this amp for a long time. I replaced all the transistors, capacitors, and the bad resistors I found, and any diodes that appeared bad. I tested all the parts I put in. They were new and I checked them. I have put the amp back in a few times and ended up shorting out...
  3. A

    2238B has -32.2V on left channel after recap

    I recently got a 2238B that needed some cleaning up, and while I had it apart I figured I'd do a recap. After I finished that I saw that it was drawing about 60W, and the relay was not closing. I found that the left channel (either side of R767) is at -32.2VDC. I've been trying to isolate where...
  4. bzenic

    SX-650: 3-4 s of Playback and 3-4 s Of Hum

    After I recapped the tone board and recapped and replaced all transistors on the vertical amp board (except the two on the heat sinks) I get only periodic playback of about 3-4 s and then the period of hum. This same sequence repeats on and on...you got the picture. What would be the most...
  5. S

    Juke box amp question

    Hello all, First time posting here, but I have a 1965 Rowe AMI Diplomat and it looks like I have a aftermarket amp in it. Can anyone identify this? If this isn't the right place to post, let me know and I'll move/delete it. Thanks again.
  6. G

    Old speaker conversions to Bluetooth

    Not sure if this is best in Speakers or DIY but I’m looking to convert an old (low-end) 1970s passive speaker to active Bluetooth. I want to build in a Bluetooth amp board and li-on/lipo battery with charger port. No desire for any buttons or knobs other than on/off and power input to run off...
    • G7065
    • Thread
    • amp board bluetooth speaker
    • Replies: 18
    • Forum: Speakers
  7. Stereoboy70

    QRX 3000 amp issues

    Hello. I’m working on a QRX 3000. I’ve rebuilt both amps but when I plug in to a DBT the light goes from dim to bright back to dim. No sound but the bulb just keeps going dim/bright/dim. Any reason why it would be doing this?? Replaced main Outputs with MJE15032. Also replaced TR...
  8. Stereoboy70

    Marantz 2216 amp board

    Hello. Just got done revamping the amp and P/S board in my 2216. New caps, all new transistors and 4 new .22 ohm resistors next to the output transistors. Plugged into a DBT and all was good. Had good sound from both channels. Plugged into a regular outlet and powered up. POOF!! Smoke...
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