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proton d540

  1. J

    Proton D540 Integrated Amp Distortion

    My D540 works but has developed a white noise kind of hiss/scratching in the background. It is on both channels, varies with the volume control setting, is independent of the selected input and is on the preamp side (doesn’t exist when I disconnect the jumpers from the preamp and put an input...
  2. Joel Kline

    What to do next?

    Hello, I new to working on electronics. I'm using tutorials, YouTube, and other sources to try to learn. I'm trying to resurrect a Proton D540 Amp and I'm stuck. Here's what's up: 1. Unit powers on and lights. 2. Relay kicks in 3. No sound. Here's what I've done: 1. I checked both sides of...
    • Joel Kline
    • Thread
    • help newbie proton d540
    • Replies: 10
    • Forum: DIY
  3. L

    2 Proton D540 bridged for horizontal bi-amping: connections?

    Hello. I have two Proton D540. I want to bridge each of them, and use each one to drive each of my two speakers (I think many people call this horizontal bi-amping). One amp (right) will serve as the amp driving the right speaker and also serve as preamp for the system, the other (left) will...
    • Labdrive
    • Thread
    • bridging amps proton d540 speaker connections
    • Replies: 3
    • Forum: Solid State
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